Visualizations

500 things you can make with JavaScript and a single <canvas> element. No WebGL, no libraries, just a 2D drawing context and a loop. Open any demo to play with it, then copy a prompt that gets your coding agent started on your own version.

  1. 001 Black Hole AstronomyA glowing accretion disk bent into a halo by gravitational lensing.
  2. 002 Tiny Planet 3DA ray traced village panorama that curls into a tiny planet, a fisheye or a camera view.
  3. 003 Aurora NatureCurtains of oxygen and nitrogen light on tilted field lines, mirrored in a lake.
  4. 004 Roman Mosaic Generative artThousands of tesserae laid in rows that follow every outline, as a Roman mosaicist would.
  5. 005 Rubik's Cube 3DA 3D cube that scrambles itself and then solves itself, layer by layer.
  6. 006 Kelvin-Helmholtz Billows FluidsA sunset sky where sliding air layers roll a cloud deck into breaking-wave billows.
  7. 007 Neon Sign Type and imageType a word and watch it get bent into glowing glass tubes on a brick wall.
  8. 008 Procedural City Generative artAn isometric city that builds itself and runs through day and night.
  9. 009 Hyperbolic Tiling MathAn endless koi garden of {p,q} ponds tiling the Poincare disk, with fish circling.
  10. 010 Bloom 3DProcedural flowers open from bud to bloom, with ruffled, translucent, veined petals.
  11. 011 Planet AstronomyA procedurally generated world with oceans, clouds and a glowing atmosphere.
  12. 012 Voxel Diorama 3DA floating voxel island with baked AO, sun shadows and a waterfall. Click to build.
  13. 013 Path Tracer 3DPhotorealistic light, computed by bouncing millions of random rays.
  14. 014 Totality AstronomyA total solar eclipse from a lakeshore, driven by the real shadow geometry.
  15. 015 Kelp Forest PhysicsBuoyant kelp sways in an ocean surge under god rays and live caustics.
  16. 016 Mandelbulb FractalsA 3D fractal, ray marched pixel by pixel on the CPU.
  17. 017 ReLU Stained Glass Machine learningA ReLU network's exact linear regions, drawn as a stained glass window.
  18. 018 Procedural Pinball RetroGenerated pinball tables in perspective, played by an AI that simulates its flips.
  19. 019 Flood Diorama FluidsA dam fails above a miniature town and a muddy flood spreads through the valley.
  20. 020 Gas Giant Weather FluidsReal 2D fluid dynamics paints turbulent belts, festoons and oval storms on a gas giant.
  21. 021 Neural Network Machine learningA tiny neural network learns to classify points, live, in your browser.
  22. 022 Bonfire FluidsA campfire whose flames are a fluid simulation colored by blackbody physics.
  23. 023 Hopf Fibration 3DThe 3-sphere as linked circles, projected into nested tori of pastel rings.
  24. 024 Painterly Rendering Generative artA harbor at dusk repainted coarse to fine in thousands of curved, bristly strokes.
  25. 025 Wormhole AstronomyFly through a traversable wormhole into another universe, with real light bending.
  26. 026 Newton Basins FractalsDrag the roots of a polynomial and Newton's method paints a fractal.
  27. 027 CRT Monitor RetroAn emulated electron beam, decaying phosphors and a shadow mask, under a 7x loupe.
  28. 028 Echo State Oracle Machine learningA never-trained random reservoir forecasts chaos on a green phosphor oscilloscope.
  29. 029 Circuit Simulator PhysicsA SPICE-style solver runs a live schematic: LEDs blink, capacitors charge, current flows.
  30. 030 Sliding Puzzle Solver GamesIDA* with pattern databases solves the 15-puzzle in the fewest possible moves.
  31. 031 Race Condition Railway SimulationThreads as trains, locks as single-line tokens: deadlock and data races you can crash.
  32. 032 Voronoi Mosaic MathDrifting seeds divide the plane into a living stained-glass mosaic.
  33. 033 Floral Ornament Generative artScrolls, acanthus leaves and flowers grow to fill any frame, like an engraver's panel.
  34. 034 Rotary Engine PhysicsA cutaway Wankel engine with exact rotor geometry and a live PV diagram.
  35. 035 Huffman Garden AlgorithmsLetter frequencies sprout into a Huffman tree drawn as a botanical plate.
  36. 036 Butterfly Scales NatureZoom from a whole butterfly into its eyespots, its scales and their ridges.
  37. 037 Spectrogram Painter SoundPaint sound in time and frequency, then watch the real spectrogram of what you hear.
  38. 038 Checker Shadow IllusionsSquares A and B are the exact same gray. Move the light and the shadow keeps lying.
  39. 039 Modem Handshake RetroThe dial-up screech, modulated and decoded live: DTMF, FSK and 16-QAM.
  40. 040 Bandit Casino Machine learningEpsilon-greedy, UCB1 and Thompson sampling race to find the best slot machine.
  41. 041 Spinning Donut 3DA shaded torus rendered point by point with a homemade z-buffer.
  42. 042 Rain on Glass FluidsRaindrops bead, merge and run down a fogged window, each a tiny upside-down city.
  43. 043 Pool Caustics PhysicsSunlight bent by a rippling pool surface draws a living net of light on the tiles.
  44. 044 Pole-Zero Filter MathDrag poles and zeros over a 3D |H(z)| surface and hear the filter you built ring.
  45. 045 Video Feedback Generative artA virtual camera films its own monitor and grows spirals, tunnels and fractals.
  46. 046 Route Planner AlgorithmsDijkstra, A*, bidirectional search and contraction hierarchies race on a printed atlas.
  47. 047 Knitting Type and imagePixel art becomes Fair Isle knitting, stitch by twisted stitch, live on the needle.
  48. 048 Cosmic Web AstronomyNoise grows into the filaments, voids and clusters of the universe.
  49. 049 Cell Sorting EmergenceA Cellular Potts tissue unmixes itself by differential adhesion, on a stained slide.
  50. 050 Laser Modes PhysicsHermite-Gauss grids, donuts and spinning vortex beams from a two-mirror laser.
  51. 051 Tree of Life SimulationA living phylogeny: species branch, die out and survive mass extinctions in a ring.
  52. 052 Metachronal Walker NatureA millipede and a centipede ripple across a sketchbook page on waves of legs.
  53. 053 Wobbly Polygons RetroA 1990s console renderer that builds every famous glitch on purpose, toggle by toggle.
  54. 054 Optimizer Topo Race Machine learningSGD, Adam, Lion and friends race downhill across a vintage topographic map.
  55. 055 Map Projections MathOne procedural planet morphing through a dozen map projections, Tissot ellipses and all.
  56. 056 Julia Set FractalsA fractal that reshapes itself as its complex constant wanders.
  57. 057 Gear Train Workshop PhysicsA blueprint bench where involute gears snap into mesh, drive clocks and jam.
  58. 058 Harmonograph Generative artA Victorian pendulum machine inks decaying roses and stars onto cream paper.
  59. 059 MCTS Bloom AlgorithmsFour-in-a-row against Monte Carlo Tree Search, its search tree blooming as a flower.
  60. 060 Bytebeat Machine SoundWhole songs from one line of bit arithmetic, drawn as a tapestry of bytes.
  61. 061 Solitons FluidsSolitary waves in a canal pass through each other unchanged, drawn as a Victorian plate.
  62. 062 Jelly PhysicsSquishy soft bodies that wobble, bounce and squash into each other.
  63. 063 Bad Random Numbers MathRANDU looks random until you turn it, then 24,000 points snap into 15 planes.
  64. 064 Rotor Cipher Machine RetroA brass and walnut rotor machine whose current you can follow through every wire.
  65. 065 Hopfield Memory Machine learningA lamp panel of 400 neurons that repairs scribbled glyphs, until it stores too many.
  66. 066 Geologic Cross-Section NatureA textbook rock section builds itself, then asks you to read its history.
  67. 067 Bubble Bank Shooter GamesA pastel bubble shooter whose AI traces 640 bank shots before every throw.
  68. 068 Kintsugi Generative artA glazed tea bowl shatters along branching cracks, then is mended with flowing gold.
  69. 069 Regex Automaton AlgorithmsType a regex and watch it compile into an NFA, a DFA and a minimal DFA.
  70. 070 Lightning SimulationBranching lightning that grows from a dielectric breakdown model.
  71. 071 Quantum Double Slit PhysicsA quantum wave packet passes through two slits and interferes with itself.
  72. 072 Point-Light Walker IllusionsThirteen dots on black, and you see a person walking, running, dancing or carrying a box.
  73. 073 Lensing Cluster AstronomyDrag a galaxy cluster and its gravity bends a deep field into giant arcs.
  74. 074 Lidar Scan 3DA spinning lidar maps a forest point by point, with ICP SLAM fixing its drift.
  75. 075 Standard Map MathLaunch orbits of a kicked rotor and paint the road to Hamiltonian chaos in watercolor.
  76. 076 Particle Life EmergenceColored particles with simple attractions that assemble into living cells.
  77. 077 Rigid Bodies PhysicsStacked towers of boxes knocked down by a swinging wrecking ball.
  78. 078 Breadboard CPU RetroA microcoded 8-bit breadboard computer paints cellular automata on a 16x16 LED matrix.
  79. 079 Kernel Trick Lift Machine learningRings no line can split are lifted into 3D, where an SMO-trained SVM slices them flat.
  80. 080 Maze Solver AlgorithmsA maze carves itself, then A* hunts for the way out.
  81. 081 Rose Window Generative artCompass-drawn Gothic tracery, glazed panes, and colored sunlight pouring across a nave.
  82. 082 Tonnetz SoundEuler's lattice of tones, where chords flip like cards and the plane folds into a torus.
  83. 083 Hidden in Pixels Type and imageA treasure map hides in a landscape's lowest bits. Peel the bit planes to find it.
  84. 084 Erosion NatureRaindrops carve rivers and valleys into a mountain range.
  85. 085 Wind Tunnel FluidsA lattice Boltzmann wind tunnel: draw any shape and watch it shed vortices.
  86. 086 Lorenz Attractor MathHundreds of trajectories swirl around the famous butterfly.
  87. 087 Chirp PhysicsTwo black holes spiral together and ring spacetime, from post-Newtonian formulas.
  88. 088 Apollonian Gasket FractalsAn endless packing of kissing circles, each engraved with its exact integer curvature.
  89. 089 Crowd Flow Fields SimulationTwo armies of 3,600 units pour across a river map, steered by one Dijkstra each.
  90. 090 Raft Consensus AlgorithmsFive servers on a whiteboard elect a leader and replicate a log. Now break them.
  91. 091 Vector Balls Retro512 chrome spheres, depth sorted, morphing from a torus knot to DNA to a smiling face.
  92. 092 Temperature Garden Machine learningGreedy, beam, top-k, nucleus and temperature sampling grown as a botanical plate.
  93. 093 Invented Atlas Generative artA parchment map of a world that never was, with rivers, realms and its own language.
  94. 094 Foucault Pendulum PhysicsA museum pendulum ploughs a rosette into sand as the Earth turns beneath it.
  95. 095 Root Braids MathLoop a quintic's coefficients and its roots braid, swap and refuse to come home.
  96. 096 Petri Fractals NatureBacterial colonies branch into fractals on starved agar, in a backlit petri dish.
  97. 097 Galaxy Collision AstronomyTwo spiral galaxies collide and fling out long tidal tails.
  98. 098 FPUT Recurrence PhysicsThe 1955 computer experiment where a chain of masses refused to thermalize.
  99. 099 Protein Folding AlgorithmsAn HP lattice protein folds a hydrophobic core under replica-exchange Monte Carlo.
  100. 100 Plucked Strings SoundSeven finite-difference strings to pluck, with live harmonics and slow-motion kinks.
  101. 101 Sandpile Identity EmergenceThe identity of the sandpile group: a fractal carpet woven from pure algebra.
  102. 102 Differential Growth Generative artOne closed line grows, buckles and folds into brain coral without ever crossing.
  103. 103 Dither Lab RetroSeven dithering algorithms race on a moving scene in 1-bit, handheld green, CGA and EGA.
  104. 104 Ambiguous Objects IllusionsPaper tubes that look round on the table and square in the mirror behind them.
  105. 105 Growing Neural Cells Machine learningCells running one tiny learned rule grow a gecko from a single seed and heal its wounds.
  106. 106 Hyperbolic Maze GamesA labyrinth in negatively curved space: the world glides past while you stay at the center.
  107. 107 Rayleigh-Taylor Fingers FluidsHeavy ink collapses into mushroom fingers in a glass tank you can turn upside down.
  108. 108 Arnold's Cat Map MathA painted cat is sheared into noise, then reassembles itself exactly on schedule.
  109. 109 Anamorphic Chalk 3DPavement chalk that snaps into a chasm, a stairway or floating cubes from one spot.
  110. 110 Interferometer PhysicsA Michelson interferometer: nudge a mirror by nanometers or send a gravitational wave.
  111. 111 Embryo Stripes SimulationA fly embryo's gene network paints seven even-skipped stripes, nucleus by nucleus.
  112. 112 Run and Tumble NatureHundreds of E. coli turn a random walk into a climb up a sugar gradient.
  113. 113 Marching Cubes AlgorithmsWatch the classic isosurface algorithm march cell by cell, then zoom out to clay.
  114. 114 ASCII Renderer Type and imageA rotating 3D scene drawn in characters chosen by shape, not just brightness.
  115. 115 Tearable Cloth PhysicsA sheet of Verlet points and springs that sags, swings and rips.
  116. 116 Mandelbrot Zoom FractalsAn endless dive into the Mandelbrot set, 10^31 times deep.
  117. 117 Plotter Landscape Generative artA mountain range inked stroke by stroke, with exact floating-horizon hidden lines.
  118. 118 Domain Coloring MathDrag the zeros and poles of a complex function and count them with a loop.
  119. 119 Palette Cycling RetroA waterfall, harbor rain and an aurora, animated without changing a single pixel.
  120. 120 Manifold Unroll Machine learningIsomap and LLE unroll a paper Swiss roll, and tear it when k is too large.
  121. 121 Microswimmers PhysicsA flagellum, Purcell's three-link swimmer and a scallop that cannot move, in Stokes flow.
  122. 122 Dark Matter Curve AstronomySwitch off the dark halo and watch a spiral galaxy fly apart.
  123. 123 Cochlea SoundAn unrolled inner ear: traveling waves on the basilar membrane sort a chord by pitch.
  124. 124 Four Color Map AlgorithmsAn antique map paints itself in four inks, repairing clashes one Kempe chain at a time.
  125. 125 Soap Film FluidsA draining soap film swirls with true thin-film colors until it turns black and pops.
  126. 126 Snowflake Growth NatureSteer the weather on a Nakaya diagram and grow one-of-a-kind snowflakes.
  127. 127 Tide Machine MathA brass Kelvin tide predictor sums ten cosines with one wire and a pen.
  128. 128 Paper Marbling Generative artInk drops, combs and styluses on a size bath, then a print pulled onto paper.
  129. 129 Light & Shadow PhysicsRed, green and blue lights cast crisp, colored shadows through spinning shapes.
  130. 130 Difference Engine RetroBrass figure wheels tabulate a polynomial with nothing but addition and rippling carries.
  131. 131 Foam EmergenceSoap foam coarsens under von Neumann's exact law, with live T1 swaps and vanishing cells.
  132. 132 Congestion Control SimulationTCP flows share one bottleneck as cars on a night on-ramp. Watch the sawtooth emerge.
  133. 133 Evolving Walkers Machine learningCreatures learn to walk by evolution, one generation at a time.
  134. 134 Palladian Villas AlgorithmsA shape grammar derives Renaissance villa plans and facades, one rule at a time.
  135. 135 Tumbling T-Handle PhysicsA spinning T-handle in zero g flips end over end, again and again.
  136. 136 Moire IllusionsTwo sheets of fine lines beat into giant ghosts, and hide a secret message.
  137. 137 Road to Chaos MathThe logistic map's bifurcations, Mandelbrot bulbs and a cobweb, linked in one picture.
  138. 138 Ocean 3DRolling waves at sunset, built from layered Gerstner waves.
  139. 139 Pen Plotter Generative artA SCARA plotter arm inks hatched, hidden-line drawings along a 2-opt optimized route.
  140. 140 Echolocation NatureA bat hunts moths in a black cave that exists only as the echoes of its calls.
  141. 141 Pool Trick Shots GamesBilliards with real spin physics and an AI that plans by simulating every shot.
  142. 142 Turing Machine RetroA brass Turing machine runs busy beavers, including all 47 million steps of BB(5).
  143. 143 Lagrange Landscape PhysicsThe restricted three-body problem as a plaster relief, Trojans looping on its summits.
  144. 144 Grokking Machine learningA tiny network memorizes modular addition, then suddenly understands it.
  145. 145 Birdsong Syrinx SoundBirdsong from a two-knob nonlinear oscillator, printed live as an ink sonogram.
  146. 146 IFS Editor FractalsSculpt fractals by dragging affine parallelograms while the chaos game redraws them.
  147. 147 Tutte Embedding AlgorithmsA hopeless tangle of edges relaxes into a crossing-free drawing, as Tutte proved it must.
  148. 148 Glyph Rasterizer Type and imageLetters become pixels: exact-area scanline coverage, subpixel RGB and hinting.
  149. 149 Starry Messenger AstronomyJupiter's moons seen through a small telescope and sketched night by night in 1610.
  150. 150 Convection Cells FluidsWater heated from below boils into mushroom plumes and rolling convection cells.
  151. 151 Snowflake Cutter MathFold paper into a 12-layer wedge, snip it, and unfold a six-fold snowflake.
  152. 152 Falling Sand SimulationSand, water, fire, lava and plants that all react with each other.
  153. 153 Iron Filings PhysicsMagnets on paper dusted with iron filings, drawn by line integral convolution.
  154. 154 Shibori Dye Generative artFold, clamp and dip cloth in indigo, then unfold a crisp symmetric shibori.
  155. 155 Mark I Perceptron RetroA 1950s-style perceptron panel: photocells, a rat's nest of wires, dials that learn.
  156. 156 Seashell Patterns NatureMeinhardt's lip chemistry paints tents, bands and dots onto a growing 3D shell.
  157. 157 Gaussian Process Ink Machine learningExact GP posteriors painted as watercolor bands with inked function samples.
  158. 158 Gridlock Solver AlgorithmsMap every position of a sliding-car puzzle, solve it, and generate harder ones.
  159. 159 Naming Game EmergenceVillagers on a hand-drawn island invent words and talk their way into dialects.
  160. 160 Bowed String PhysicsHelmholtz motion on a bowed violin string, with a Schelleng diagram measured live.
  161. 161 Fourier Epicycles MathA chain of spinning circles traces any drawing you give it.
  162. 162 Damascus Steel Generative artForge pattern-welded steel as a chain of exact maps, then grind and etch the blade.
  163. 163 Rotating Drum PhysicsGrains in a turning drum avalanche and sort themselves: big outside, small in the core.
  164. 164 Vocal Tract SoundA physically modeled throat that sings vowels, drawn as a midsagittal anatomy plate.
  165. 165 Particle Filter Robot AlgorithmsThousands of pose guesses condense out of fog onto a lost robot's true position.
  166. 166 SPH Water FluidsThousands of particles that slosh, splash and pour like a liquid.
  167. 167 Sector Engine RetroA 2.5D portal engine in the mid-90s style: a slow walk round a castle at golden hour.
  168. 168 Deep Q Snake Machine learningA deep Q-network learns snake from scratch, live, on a retro dot-matrix LCD.
  169. 169 Borsuk-Ulam Weather MathA topology theorem guarantees two antipodes share the weather. Watch them get found.
  170. 170 Drying Mud SimulationWet clay dries and cracks into a lakebed of curling plates, primaries first.
  171. 171 Hybrid Images IllusionsOne picture, two subjects: an owl up close, a cat from across the room.
  172. 172 Minnaert Rain NatureWatercolor rain whose sound is built from first principles: ringing bubbles, not samples.
  173. 173 Spiral Galaxy AstronomyTens of thousands of stars wheel through glowing spiral arms.
  174. 174 Ball Pit PhysicsHundreds of colorful balls tumble, stack and bounce off each other.
  175. 175 SDF Sculptor 3DDigital clay: press on soft lumps or carve them away, ray marched in a tiny photo studio.
  176. 176 Lyapunov Fractal FractalsType a string of A and B and the logistic map grows gold and teal enamel jewelry.
  177. 177 Wallpaper Groups Generative artPaint once and any of the 17 plane symmetry groups repeats the stroke across the plane.
  178. 178 Core Arena AlgorithmsAssembly warriors battle for 8,000 cells of shared memory on a real Redcode VM.
  179. 179 Breakout GamesThe arcade classic, with sparks, screen shake and an autopilot.
  180. 180 Photoelasticity PhysicsClear plastic parts under load light up with stress fringes between polarizers.
  181. 181 Rolling Shutter Type and imageA phone-camera sensor reads one row at a time: propellers bend, strings ripple.
  182. 182 Space-Filling Curves MathHilbert, Peano, Gosper and friends fold smoothly from one order to the next.
  183. 183 Synthwave Flyover RetroAn endless neon wireframe landscape under a striped sunset.
  184. 184 Normalizing Flow Machine learningAn invertible network trains live and bends a Gaussian and its grid like taffy.
  185. 185 Wireworld Circuits EmergenceA four-rule cellular automaton runs a six-bit counter and logic gates on a PCB.
  186. 186 Agate Bands NatureLiesegang precipitation grows the concentric bands of a polished agate slab.
  187. 187 Vinyl Groove SoundZoom 1,500x from a turntable into the groove, cut from a synthesized track.
  188. 188 Ice Crystal Halos PhysicsSundogs, arcs and halos built up live from millions of rays traced through ice.
  189. 189 Sumi-e Brush Generative artA bristle-by-bristle ink brush paints bamboo on rice paper that wicks and bleeds.
  190. 190 Gastrulation SimulationA vertex-model embryo folds its own gut, purely from cell mechanics.
  191. 191 PCB Annealer AlgorithmsSimulated annealing places chips on a circuit board, then a maze router lays copper.
  192. 192 Plankton Bloom FluidsEddies stir green diatom and turquoise coccolith blooms, like ocean-color imagery.
  193. 193 Fourier Darkroom MathPaint on a picture's 2D spectrum and watch the inverse FFT redraw it instantly.
  194. 194 SOFAR Channel PhysicsSound rays bend into the ocean's deep channel, lighting up caustics and shadow zones.
  195. 195 Sprite Stacking RetroA cozy pixel town where every house, car and tree is a pile of flat slices.
  196. 196 t-SNE Constellations Machine learning2,000 glyph images in 196 dimensions flow into constellations under live t-SNE.
  197. 197 Earth-Rotation Synthesis AstronomyRadio dishes ride the turning Earth to image a hidden galaxy, then CLEAN it.
  198. 198 Girih Star Patterns Generative artInterlaced Islamic star patterns built live from one angle over a hidden tiling.
  199. 199 Murmuration NatureThousands of starlings flock in 3D and scatter from a falcon.
  200. 200 Self Healing Code AlgorithmsScratch, smudge and tear a printed barcode while Reed-Solomon algebra repairs it live.
  201. 201 Near Light Speed PhysicsDrive a city street near light speed and see what relativity really does to the view.
  202. 202 Miura Fold MathMiura-ori, Yoshimura and waterbomb sheets fold with exact rigid-origami kinematics.
  203. 203 Rotating Snakes IllusionsA perfectly still image whose wheels turn wherever you are not looking.
  204. 204 Magnetic Pendulum FractalsA pendulum over three magnets, and the fractal map of where every release point ends up.
  205. 205 Knot Table 3DPrime knots up to seven crossings, relaxed as tubes, with live Alexander polynomials.
  206. 206 CPU Pipeline RetroA five-stage RISC pipeline as an isometric factory: bubbles, bypasses and flushes.
  207. 207 FM Synthesis SoundA four-operator FM synth whose sidebands land exactly where Bessel functions say.
  208. 208 Diffusion Sketchpad Machine learningA diffusion model trains live and condenses pure noise into whatever shape you draw.
  209. 209 Three-Body Ballet PhysicsTwenty-two periodic three-body orbits, inked like calligraphy until a nudge breaks them.
  210. 210 Tsunami SimulationA quake lifts the seafloor and a tsunami races across a live nautical chart.
  211. 211 Slime Mold EmergenceSimple agents leave trails that self-organize into living networks.
  212. 212 Haeckel Plates Generative artAn endless folio of generative radiolarians, diatoms and medusae in lithograph ink.
  213. 213 Faraday Waves FluidsA shaken dish of liquid locks into stripes, squares, hexagons and a 12-fold quasicrystal.
  214. 214 Wave Function Collapse AlgorithmsA tile-based world that assembles itself one consistent cell at a time.
  215. 215 SLE Curves MathRandom fractal curves grown tip first from Loewner's equation, kappa by kappa.
  216. 216 Bokeh Camera Type and imageA night street shot through a simulated lens, with polygonal bokeh and cat's eyes.
  217. 217 Meandering River NatureCenturies of a meandering river, with oxbow lakes and scroll bars, on a survey map.
  218. 218 Phased Array PhysicsSteer and focus a beam of sound with per-speaker delays in a live 2D wave simulation.
  219. 219 Mancala GamesThe ancient sowing game on a carved wooden board, played by minimax with alpha-beta.
  220. 220 Chiptune Tracker RetroAn 8-bit sound chip emulated from scratch, playing a procedurally composed song.
  221. 221 Symbolic Regression Machine learningGenetic programming breeds formulas until it rediscovers the law behind the data.
  222. 222 Stellar Vampire AstronomyA star overflows its Roche lobe and feeds a white dwarf's disk until it ignites a nova.
  223. 223 Hash Avalanche AlgorithmsReal SHA-256 woven round by round: flip one input bit and half the state catches fire.
  224. 224 Random Matrix Spectra MathEigenvalues of random matrices repel like charges, live, every frame.
  225. 225 Hydrogen Orbitals PhysicsExact hydrogen wavefunctions as glowing 3D point clouds, colored by quantum phase.
  226. 226 Rose Engine Generative artA simulated rose engine lathe cuts banknote-fine guilloche, one pass at a time.
  227. 227 Modular Synth SoundA eurorack case with a working signal graph and patch cables that sag and swing.
  228. 228 Wildfire SimulationA fire runs uphill and downwind across a topographic incident map, trailing smoke.
  229. 229 Dynamical Billiards PhysicsA fan of 1,000 balls in reshapable tables, linked live to the Birkhoff phase map.
  230. 230 Fractal Tree NatureA recursive tree that grows, blossoms and sways in the wind.
  231. 231 Ship Wake FluidsA boat carves the 19.47 degree Kelvin wake, which emerges from dispersion alone.
  232. 232 Datamosh RetroA real motion-compensated codec, fed a broken stream until the video melts.
  233. 233 Lambda Diagrams MathLambda calculus drawn as Tromp diagrams and reduced one beta step at a time.
  234. 234 Constraint Solver AlgorithmsA sudoku solver reasons in pencil, guesses in ink, and erases when it is wrong.
  235. 235 Gaussian Splatting Machine learning3D Gaussian splatting in a 2D canvas, trained from scratch by gradient descent.
  236. 236 Buddhabrot FractalsEscaping Mandelbrot orbits stacked into a deep-space nebula by Metropolis-Hastings.
  237. 237 Evolved Triangles Generative artTwo hundred translucent triangles evolve from chaos into a painted landscape.
  238. 238 Anamorphic Mirror IllusionsA wildly warped drawing that a chrome cylinder turns back into a picture.
  239. 239 Marimba Bar Tuner PhysicsCarve a rosewood bar while a finite element solver retunes its overtones to 1:4:10.
  240. 240 Turing Patterns EmergenceTwo chemicals react and diffuse into coral, spots and stripes.
  241. 241 Wythoff Kaleidoscope 3DOne draggable seed in a mirror triangle generates every convex uniform polyhedron.
  242. 242 Curve Shortening MathA tangled island shrinks by its own curvature and leaves a topographic map behind.
  243. 243 RRT* Parking AlgorithmsA self-driving car grows a tree of curved manoeuvres, then reverses into its spot.
  244. 244 Truss Bridge Builder PhysicsDraft a bridge on blueprint paper, then send a truck over as each beam shows its stress.
  245. 245 Pond Drop NatureA drop of pond water under a brightfield microscope, with a focus knob you can turn.
  246. 246 Parametric Type Type and imageA Metafont-style alphabet drawn by a parametric pen, morphing through ten styles.
  247. 247 Star Trails AstronomyA long exposure builds over a mountain camp as the sky wheels around the celestial pole.
  248. 248 Voxel Space RetroFly low over a mountain valley with the 1992 Comanche terrain trick.
  249. 249 Attention Loom Machine learningA tiny transformer learns to braid, reverse and sort digits, attention woven as thread.
  250. 250 Multiscale Truchet Generative artTruchet tiles at five scales lock together seamlessly, flipping color at each level.
  251. 251 Critical Percolation SimulationOpen hexagons merge into a giant cluster the instant p crosses one half.
  252. 252 Generative Music SoundA self-composing synthesizer you can see, played with the Web Audio API.
  253. 253 Seismic Shadow PhysicsQuake waves curve through a cutaway Earth, leaving the shadows that revealed its core.
  254. 254 Asteroids GamesThe arcade classic with glowing vector lines and an AI pilot.
  255. 255 Water Ripples FluidsRaindrops on a koi pond, with ripples that bend the scene below.
  256. 256 Penrose Pentagrid MathFive grids of parallel lines dualize into a living Penrose tiling of stained glass.
  257. 257 Seamless Clone AlgorithmsPoisson image editing: a pasted moon takes on the light of a sunset sky.
  258. 258 Zen Garden Generative artRaked gravel in low morning sun, its furrows flowing around mossy stones.
  259. 259 Radiating Charge PhysicsShake an electric charge and watch light peel off its field lines at c.
  260. 260 Oscilloscope Music RetroA phosphor XY scope draws a 4D tesseract, knots and text from the stereo sound you hear.
  261. 261 NEAT Species Machine learningNetworks grow their own topology to balance two poles, while species rise and fall.
  262. 262 Phyllotaxis NatureThe golden angle emerges from inhibition on a growing shoot tip, then builds a sunflower.
  263. 263 Menger Flythrough FractalsAn endless dive into a sunlit Menger sponge that never runs out of smaller holes.
  264. 264 Cooperation EmergenceA few defectors in a sea of cooperators unfold into an endless symmetric kaleidoscope.
  265. 265 Catalan Bijections MathOne Catalan object drawn five ways at once, linked piece by piece as it morphs.
  266. 266 Sky Machine PhysicsDrag the sun and watch real Rayleigh and Mie scattering paint the sky.
  267. 267 JPEG Anatomy AlgorithmsA real JPEG codec runs live on a moving scene, every stage down to its 64 cosines.
  268. 268 Melting Crystal SimulationNearly 2,000 atoms freeze into crystal grains, melt and boil from one pairwise force.
  269. 269 Ames Room IllusionsIdentical twins become a giant and a child inside a room that only looks square.
  270. 270 Comet AstronomyA comet rounds the Sun and grows a straight blue ion tail and a curved dust tail.
  271. 271 Lava Lamp Generative artGlowing blobs that merge and split like a lava lamp.
  272. 272 Engraving Renderer 3DA moving 3D still life printed as a copperplate engraving, line by swelling line.
  273. 273 Chladni Plate SoundSand dances into Chladni figures on a brass plate whose modes come from the Ritz method.
  274. 274 Teletext RetroA working teletext decoder: mosaic graphics, carousel pages and hidden answers.
  275. 275 Evolution Strategy Landers Machine learningFifty ghost landers learn soft touchdowns by natural evolution strategies.
  276. 276 Rainbow Optics PhysicsA double rainbow, dark band and fogbow computed from Snell's law and wave optics.
  277. 277 Glowing Surf FluidsMoonlit waves break on a beach and the plankton in them flash electric blue.
  278. 278 Orb Weaver NatureA garden spider builds a real orb web, step by step, then guards its dewy net.
  279. 279 Gaussian Primes MathA frog hops across the Gaussian primes, looking for a way to infinity.
  280. 280 Max Flow Waterworks AlgorithmsWater fills a hand-drawn pipe network until the minimum cut lights up in red.
  281. 281 Seam Carving Type and imageContent-aware resizing: seams peel away and the lighthouse stays intact.
  282. 282 Bubble Chamber PhysicsArchival film of particle tracks: tightening spirals, V decays and pairs.
  283. 283 Flow Field Generative artThousands of particles ride an evolving noise field into silky trails.
  284. 284 Raycaster RetroA Wolfenstein-style 3D maze drawn one column at a time.
  285. 285 Lottery Ticket Machine learningPrune a network to a sparse winning ticket that still learns, round by round.
  286. 286 Einstein Hat Tiling MathThe 2023 aperiodic monotile, grown from its metatiles and morphed toward the spectre.
  287. 287 Aperture Diffraction PhysicsDraw any aperture and see its diffraction pattern in true spectral color.
  288. 288 Heart Tissue SimulationSpiral waves, arrhythmia and defibrillation in a living sheet of heart muscle.
  289. 289 Blocks World Planner AlgorithmsA robot arm plans with A* over STRIPS states, then stacks the blocks to match your goal.
  290. 290 Neuron Growth NatureA Golgi-stained circuit grows its dendrites and axons, wires up, then fires.
  291. 291 Rendezvous GamesDock a capsule with a station, where thrusting toward it sends you backward.
  292. 292 Lenia EmergenceSmooth artificial life: glowing creatures that glide, spin and divide.
  293. 293 Euclidean Rhythms SoundRisograph bead rings play world rhythms made by a neutron accelerator timing algorithm.
  294. 294 Indra's Pearls FractalsLimit sets of Kleinian groups, strung as glowing necklaces of nested circles and pearls.
  295. 295 Fireworks Generative artShells arc, burst and crackle with glowing, fading sparks.
  296. 296 Antikythera Mechanism AstronomyThe 2,000-year-old Greek computer, every gear meshing, scrubbing across centuries.
  297. 297 Blacksmith's Forge PhysicsHeat, hammer and quench a steel bar whose glow and temper colors come from physics.
  298. 298 Ink in Water FluidsA real fluid solver swirls colored dye like ink in water.
  299. 299 Ford Circles MathA circle for every fraction, and a dive into why the golden ratio is the most irrational.
  300. 300 Demoparty Intro RetroA one-minute demoscene production, beat-synced to a tune synthesized from code.
  301. 301 Ghost Racers Machine learningSixty neural-net cars evolve to race a track, then face one you draw.
  302. 302 Dancing Links AlgorithmsKnuth's Algorithm X tiles boards with wooden pentominoes while its links visibly dance.
  303. 303 Quantum Billiards PhysicsA quantum wave packet bounces around chaotic billiards and leaves scars.
  304. 304 Hidden 3D IllusionsA live magic eye picture: a turning 3D sculpture hidden in colorful noise.
  305. 305 Dandelin Spheres 3DTwo spheres wedged in a sliced cone prove the focus property, with no algebra.
  306. 306 Tentacles NatureInverse kinematics tentacles reach and curl toward the pointer.
  307. 307 Xenakis Glissandi Generative artMetastaseis-style string glissandi as ruled surfaces on graph paper, and a gas of notes.
  308. 308 Paper Dragon MathFold a paper strip in half seven times, open every crease to 90 degrees: a dragon.
  309. 309 Gene Surfing SimulationDrift at a growing colony's edge splits red and green bacteria into jagged sectors.
  310. 310 Double Pendulum PhysicsPendulums that start almost identical and end up worlds apart.
  311. 311 Perfect Snake AlgorithmsA snake AI that can never crash, cutting safe shortcuts until it fills every cell.
  312. 312 Pseudo 3D Road RetroA sunset coastal highway faked the 80s arcade way, from flat segments and sprites.
  313. 313 Spiking Raster Machine learningA thousand Izhikevich neurons learn by spike timing and ripple with travelling waves.
  314. 314 Particle Type Type and imageWords made of thousands of particles that scatter and regroup.
  315. 315 Room Echoes SoundClap in a room on a blueprint and hear its exact echoes, from bathroom to cathedral.
  316. 316 Doppler and Sonic Boom PhysicsA jet's wavefronts crowd into a Mach cone, and the boom lands when the cone does.
  317. 317 Leapfrogging Vortices FluidsSmoke rings take turns slipping through each other, from pure vortex dynamics.
  318. 318 Kaleidoscope Generative artDraw once, and twelve mirrored strokes bloom into a mandala.
  319. 319 Four-Dimensional Polytopes MathAll six regular 4D polytopes, double-rotating through themselves in stereographic 3D.
  320. 320 Bait Ball Emergence1,400 silver sardines mill, stream and pack into a bait ball as dolphins close in.
  321. 321 Leaf Venation NatureVeins chase auxin sources across a growing leaf, pressed onto a herbarium sheet.
  322. 322 Pulsar AstronomyA spinning neutron star's beams become dispersed radio sweeps you de-disperse by hand.
  323. 323 Edge Detection AlgorithmsThe full Canny pipeline, ending in Hough-detected lines and circles.
  324. 324 Shattered Pane PhysicsA sunny window breaks into radial and ring cracks, then shards tumble and glint.
  325. 325 Self-Organizing Quilt Machine learningKohonen maps sew a quilt from fabric dyes and drape a sheet over 3D point clouds.
  326. 326 Topological Snake GamesSnake on a torus, a Klein bottle and a projective plane, with the real surface turning beside it.
  327. 327 Sound of Mandelbrot FractalsHover the Mandelbrot set to see and hear orbits: each bulb's period plays as a loop.
  328. 328 Moon Lander RetroVector-line lunar descent on a green phosphor tube, with a suicide-burn autopilot.
  329. 329 Color Constancy IllusionsStrawberries under cyan light: not a single red pixel, and they still look red.
  330. 330 Kakeya Needle MathTurn a needle all the way around in a disk, a deltoid, then sprouting Perron trees.
  331. 331 Pigment Mixing SimulationBlue and yellow paint make green here: spectral Kubelka-Munk mixing beside naive RGB.
  332. 332 Interior Mapping 3DA night skyline of thousands of furnished, lit rooms, and not one of them has geometry.
  333. 333 Biomorphs AlgorithmsDawkins' Blind Watchmaker: breed recursive ink creatures by choosing a child.
  334. 334 Pixel Sorting Type and imageGlitch-art pixel sorting run live on painted photos, at any angle.
  335. 335 Hologram PhysicsRecord an off-axis hologram of glowing points, then rebuild the 3D scene from it.
  336. 336 Op Art Generative artRiley and Vasarely style compositions that ripple, bulge and vibrate.
  337. 337 Forest of Light NatureTrees grow by competing for light in a watercolor forest that turns with the seasons.
  338. 338 Ringmaker AstronomyBacklit planetary rings with shepherd moons, wavy gap edges, propellers and waves.
  339. 339 Phase Music SoundTwo players loop one figure, one slightly faster, printing a moire record of the drift.
  340. 340 Active Asters EmergenceMicrotubules and motor proteins self-organize into asters, in two-color fluorescence.
  341. 341 Dissection Proofs MathProofs without words in cut paper, plus any polygon you draw cut into any other.
  342. 342 Bloch Sphere PhysicsA qubit on the Bloch sphere: gates, Rabi flips, decoherence and a spin echo.
  343. 343 Fourier Features Machine learningA plain MLP, random Fourier features and a SIREN race to memorize one picture.
  344. 344 Stroboscope IllusionsWheels stop, creep and spin backwards under a film camera or a strobe.
  345. 345 Sorting Network AlgorithmsA sorting network as a wooden marble run: brass gates swap marbles into order.
  346. 346 Through Other Eyes Type and imageA fruit market, a metro map and test plates as dichromats see them.
  347. 347 Solar Surface AstronomyGranulation, sunspots and flaring magnetic loops at the Sun's limb, in three wavelengths.
  348. 348 Sailing Regatta PhysicsA watercolour yacht race where boats tack upwind because their polars say so.
  349. 349 Climbing Vine NatureSweet pea shoots circle, grab supports with tendrils and coil into springs.
  350. 350 Coffee Ring FluidsCoffee drops dry into dark rings, beside two tricks that make them dry evenly.
  351. 351 Chrome Blob 3DA wobbling liquid metal droplet with real reflections, rasterized by hand.
  352. 352 Prime Spirals MathA million integers on Ulam and Sacks spirals, where prime-rich polynomials glow as rays.
  353. 353 Ink Landscape Scroll Generative artAn endless ink handscroll of misty peaks, pines, pavilions and boats, unrolling.
  354. 354 Balancing Mobile AlgorithmsA red-black or AVL tree hangs as a spring-physics mobile while a plain BST droops.
  355. 355 Visual Cryptography IllusionsTwo sheets of pure noise. Slide one over the other and a secret appears.
  356. 356 Mountain Wave Clouds SimulationWind over a range rings into lee waves, and saucer clouds stack at the crests.
  357. 357 Prism Puzzle GamesSplit white light with rutile prisms to light colored targets. A search AI plays.
  358. 358 Optical Bench PhysicsA blueprint ray tracer: prisms, lenses, mirrors and a fiber with real glass dispersion.
  359. 359 Gaussian Mixture EM Machine learningExpectation maximization fits Gaussians to a painting and turns it into a poster.
  360. 360 Rubens' Tube SoundGas flames on a brass pipe rise and dip with the standing sound wave inside.
  361. 361 Automaton Orchestra EmergenceElementary cellular automata woven into cloth on a loom and played as music.
  362. 362 Droste Spiral Type and imageEscher's Print Gallery effect: a painted harbor town that spirals into itself forever.
  363. 363 Transit Hunter AstronomyPlanets dim a spotted star; a box-least-squares search and RV fit find them.
  364. 364 Roguelike Explorer RetroAn amber-terminal dungeon crawl that explores itself, cat in tow, by rolling down a Dijkstra map.
  365. 365 Siteswap Juggler MathJuggling notation made physical: true parabolas, a ladder diagram and the state graph.
  366. 366 Rebound Robots AlgorithmsRobots slide until they hit something. A* finds the fewest moves to the target.
  367. 367 Tree Rings NatureA pine grows for a century under a simulated climate, one sanded ring per year.
  368. 368 Marble Computer PhysicsA wooden pegboard computer where falling marbles count, add and multiply in binary.
  369. 369 Geometric Illusions IllusionsSix classic illusions on graph paper, and a lab that measures how much they fool you.
  370. 370 Watercolor Generative artPigment rides a shallow-water layer, pools at the edges and granulates on paper.
  371. 371 Tensegrity 3DStruts that never touch, floating in a web of cables, found by dynamic relaxation.
  372. 372 Paper Glider PhysicsA notebook-paper glider that stalls, porpoises and circles in thermals for real.
  373. 373 Viterbi Trellis Machine learningA hidden Markov model catches a dealer swapping in a loaded die, roll by roll.
  374. 374 Music of the Primes MathRiemann's explicit formula rebuilds the prime staircase from 500 zeta zeros.
  375. 375 Spatial Indexes AlgorithmsQuadtree, k-d tree, BVH and grid rebuilt every frame over thousands of moving points.
  376. 376 Baby Universe AstronomyTune the universe's ingredients and watch the microwave sky respond.
  377. 377 Risograph Press Type and imageA poster printed in CMYK or two riso inks, with a loupe that shows the rosettes.
  378. 378 Wood Wide Web NatureRoots and fungal hyphae weave a soil network that shuttles carbon to shaded seedlings.
  379. 379 Neural Ecosystem EmergenceHerbivores and predators with tiny neural brains evolve in a pastel petri dish.
  380. 380 Perceptual Codec SoundWatch a psychoacoustic model decide which parts of the music you will never miss.
  381. 381 Neutrophil Chase SimulationA crawling white blood cell hunts a bacterium among red cells, in grainy phase contrast.
  382. 382 Soap Film Steiner Trees PhysicsSoap films between pegs relax into Steiner trees, meeting at 120 degrees.
  383. 383 Aperture Problem IllusionsOne grating, one true motion, three holes that each report a different direction.
  384. 384 Cache Lines AlgorithmsFour loop orders of one matrix multiply race through a simulated cache hierarchy.
  385. 385 Tessellation Morph MathDrag one edge of an Escher-style creature and every copy reshapes while still tiling.
  386. 386 Honey Coiling FluidsHoney falls onto toast and coils, loops and meanders like a real viscous rope.
  387. 387 Marble Labyrinth GamesA wooden tilt maze where a careful AI steers a steel ball between the holes.
  388. 388 Topographic Survey Generative artEroded terrain printed as a survey sheet with labeled contours, streams and hillshade.
  389. 389 Retrograde Loops AstronomyWhy Mars backs up against the stars, drawn by Copernicus and Ptolemy side by side.
  390. 390 Impact PhysicsA grain-by-grain slice of layered regolith as impactors dig craters, in slow motion.
  391. 391 CMA-ES Machine learningAn evolution strategy's search ellipse stretches, turns and collapses onto the optimum.
  392. 392 Gyroid Caves 3DFly through glassy minimal surface labyrinths, with a second maze behind every wall.
  393. 393 Lens Flare Type and imageDrag the sun over the dunes; ghosts traced through a real lens follow it.
  394. 394 Cuttlefish Skin NatureThousands of chromatophores play passing clouds and camouflage on a cuttlefish.
  395. 395 Diff Graph AlgorithmsMyers' O(ND) diff, the algorithm behind git diff, as a search through the edit graph.
  396. 396 Inscribed Squares MathEvery closed curve hides a square? Draw one and watch the hunt (open since 1911).
  397. 397 Missing Fundamental IllusionsPeel a note's harmonics away, fundamental first, and the heard pitch refuses to move.
  398. 398 Magnetic Bottle PhysicsParticles gyrate, bounce and drift in Earth's dipole, filling the radiation belts.
  399. 399 Glenz Vectors RetroNested glassy checkered polyhedra bounce on a glossy floor, then shatter and rebuild.
  400. 400 Rock Paper Lizards EmergenceThree lizard morphs chase each other in spirals until mobility tips them into extinction.
  401. 401 Drumhead SoundA floor tom whose sound is sampled live from the 2D wave equation that draws its head.
  402. 402 Planet Forge AstronomyA dusty disk grows rocky worlds, ice giants and gas giants by N-body accretion.
  403. 403 Collatz Coral Generative artThousands of Collatz sequences grow backward from 1 into a swaying coral.
  404. 404 Elastic Net TSP AlgorithmsA rubber band of neurons wriggles through a map of cities until it becomes a tour.
  405. 405 Mirage PhysicsBent light over hot asphalt and cold sea: road puddles, floating cars, Fata Morgana.
  406. 406 CPPN Garden Machine learningBreed images grown by tiny neural networks by picking the ones you like.
  407. 407 Dendrites SimulationSupercooled melt freezes into branching dendrites, with latent heat glowing between arms.
  408. 408 Compression Echoes Type and imageLZ77 compresses a poem while every back-reference loops back over the page in gold.
  409. 409 Chromaticity Lab MathDraw any light's spectrum and watch it land on the CIE 1931 horseshoe.
  410. 410 Volumetric Clouds NatureRaymarched cumulus with silver linings, light shafts and drifting shadows.
  411. 411 Foveated Vision IllusionsWhat one eye really captures: a sharp fovea, a blurry gray periphery and a blind spot.
  412. 412 Shadow Sculpture 3DOne carved object casts three different shadows at once. Draw your own.
  413. 413 Hanging Chain Arches PhysicsHang chains and weights, then flip the sheet to turn them into stone arches.
  414. 414 Grand Tour GamesPlan a probe's slingshot route past Jupiter, Saturn, Uranus and Neptune.
  415. 415 Romanesco FractalsA romanesco head of cones on cones on cones, with a dive into its endless florets.
  416. 416 Garbage Collector AlgorithmsA heap as a warehouse: crates turn white, grey and black, then the dead get swept.
  417. 417 Analemma AstronomyA garden noon mark traces the figure eight of Earth's orbit, one stud a day.
  418. 418 Triangle Centers MathDrag a triangle: 46 Kimberling centers, the Euler line and Morley's triangle follow.
  419. 419 Self-Assembly EmergenceLipid membrane patches assemble themselves from a random soup into closed vesicles.
  420. 420 Rogue Waves FluidsA storm swell where walls of water rise from nowhere through nonlinear focusing.
  421. 421 BPE Tokenizer Type and imageByte pair encoding learns a vocabulary live, fusing typeset tiles merge by merge.
  422. 422 Snow and Slush PhysicsSnowballs, jelly, sand and water smash and tumble down a slope, simulated with MLS-MPM.
  423. 423 Latent Face Atlas Machine learningA VAE learns cartoon faces in seconds and lays out its latent space as a map of faces.
  424. 424 Kolam Generative artA hand traces a rice-flour kolam: one unbroken line looping around every dot.
  425. 425 Basalt Columns NatureCooling lava cracks into columns that drift toward hexagons, on an isometric causeway.
  426. 426 Anaglyph Cathedral IllusionsA sunlit gothic nave in real stereo 3D: red-cyan glasses, crossed eyes or wiggle.
  427. 427 Glass Harp SoundRay-traced wine glasses, tuned with water and sung by stick-slip friction on the rim.
  428. 428 Sokoban Forge AlgorithmsCrate puzzles forged by playing backward from the goals, then solved by A*.
  429. 429 Lights Out Algebra MathThe toggle-tile puzzle solved instantly at any size by linear algebra over GF(2).
  430. 430 Wind Walker PhysicsA six-legged beach machine walks on Theo Jansen's eleven-bar linkage.
  431. 431 Infinity Mirror 3DA mirrored room of neon and glowing orbs, reflected into an endless kaleidoscope.
  432. 432 Kirkwood Gaps AstronomyThousands of asteroids and Jupiter's resonances carving gaps into a featureless belt.
  433. 433 Hurricane SimulationA satellite loop of a hurricane, driven by a vortex you can steer over a warm ocean.
  434. 434 Split-Flap Board RetroA clattering departures board: every flap falls on a hinge, in perspective.
  435. 435 One Line Portrait Type and imageThousands of stipple dots become one unbroken pen line, untangled by 2-opt.
  436. 436 Sorting Tapestry AlgorithmsSix sorting algorithms cross-stitch a scrambled sampler back into a rainbow.
  437. 437 Waterfall Illusion IllusionsStare for twenty seconds, then watch a frozen picture drift the other way.
  438. 438 Discharge Tubes PhysicsGlowing gas tubes whose colors are computed from their real spectral lines.
  439. 439 GAN Duel Machine learningA generator and a discriminator fight live over a 2D target, failure modes and all.
  440. 440 Rock Thin Section NatureRock slices blaze with interference colors under a polarizing microscope.
  441. 441 Self-Replicating Loops EmergenceLangton's 1984 loops copy their own genome and tile the plane with a glass colony.
  442. 442 Bertrand's Paradox MathOne question about a random chord, three honest recipes, three different answers.
  443. 443 Weaving Loom Generative artA floor loom weaves shaded yarn cloth live from historical drafts you can edit.
  444. 444 Cosmic Light Cone AstronomyOur past light cone, horizons and galaxies in the expanding universe, drawn three ways.
  445. 445 Alpha-Beta Othello GamesOthello against alpha-beta search, with its pruned tree unfurling beside the board.
  446. 446 Spacetime Train PhysicsA train, a tunnel and a light clock, with a live Minkowski diagram in either frame.
  447. 447 Granular Cloud SoundGranular synthesis made visible: every grain is a glowing droplet shaped by its window.
  448. 448 Fitness Landscape AlgorithmsFive populations climb a rugged fitness landscape, then get stranded when it shifts.
  449. 449 Subdivision Surfaces 3DCatmull-Clark turns an editable cube cage into a smooth clay creature, live.
  450. 450 String Art Type and imageOne black thread, thousands of straight chords, and a face appears on the loom.
  451. 451 Shepard Staircase IllusionsA procession climbs Penrose's impossible stairs while a Shepard tone rises forever.
  452. 452 Elliptic Curves MathChord-and-tangent addition on a real curve, rolled up into the finite-field torus.
  453. 453 Peppered Moths NatureYou are the bird: selection turns moths invisible on lichen, then on sooty bark.
  454. 454 Eye Optics PhysicsReal ray tracing through a model human eye that focuses, blurs and wears glasses.
  455. 455 Autograd Circuit Machine learningType a formula and watch reverse-mode autodiff run on a printed circuit board.
  456. 456 Joukowski Airfoil FluidsExact flow past a wing, made by conformally mapping flow around a circle.
  457. 457 Ising Magnet SimulationA magnet at its critical point, where domains of spins turn fractal.
  458. 458 Image Tracer AlgorithmsPixel art and a painted landscape traced into crisp, infinitely zoomable curves.
  459. 459 Ground Tracks AstronomyThe snakes, loops and figure eights real orbits trace over a turning world.
  460. 460 Social Amoebae EmergenceStarving amoebae relay spiral waves of cAMP and stream together into mounds.
  461. 461 Millefiori Cane Generative artBuild glass canes by casing, moulding and bundling, then slice them into a paperweight.
  462. 462 Gravity Turn PhysicsA two-stage rocket flies pad to orbit on a live blueprint, max-Q and all.
  463. 463 Change Ringing MathEight bells ring Cambridge and Grandsire: walks through the symmetric group.
  464. 464 Afterimage IllusionsStare at a surreal landscape, then see full color in a picture that is pure gray.
  465. 465 Broad-Nib Calligraphy Type and imageA dip pen writes italic and uncial letters; thick and thin come from the nib angle.
  466. 466 Action Potential NatureHodgkin-Huxley spikes race down an axon while every ion channel opens and shuts.
  467. 467 Minesweeper Oracle AlgorithmsEvery hidden cell shows its exact mine probability while an AI plays the safest move.
  468. 468 Mode 7 Track RetroThe per-scanline floor trick of 16-bit kart racers, with a debug view of every row.
  469. 469 Music Box SoundA pinned brass drum plucks cantilever tines from a punched strip you can edit.
  470. 470 Impossible Rooms 3DA house that cannot exist: a ballroom in a wardrobe, a corridor longer inside than out.
  471. 471 Seed Dispersal PhysicsSamaras autorotate, dandelion seeds parachute and leaves flutter across a gusty meadow.
  472. 472 Skip-gram Constellation Machine learningWord2vec learns from scratch, and king minus man plus woman lands on queen.
  473. 473 Orbital Resonance AstronomyA seven-planet resonant chain that chimes on every transit and weaves its own spirograph.
  474. 474 Slicing Four Dimensions MathA hyperplane sweeps through 4D shapes, leaving glassy 3D cross sections.
  475. 475 Drift Racer GamesPacejka tire physics on a generated circuit, with a drifting AI that plans ahead.
  476. 476 Celtic Knotwork Generative artManuscript knot panels woven from a grid of breaks. Click to reweave the threads.
  477. 477 Ant Farm EmergenceA colony digs its nest grain by grain behind glass, with no plan but local rules.
  478. 478 Impossible Architecture IllusionsWalkers climb Penrose stairs forever on a pastel tower whose paths only meet on screen.
  479. 479 Wind Harp PhysicsAn Aeolian harp on a misty hill: vortex shedding picks the harmonic each string sings.
  480. 480 Cuckoo Hash Hotel AlgorithmsThree pastel hotels, three hash tables: linear probing, Robin Hood and cuckoo.
  481. 481 Syntax Railroad Type and imageA recursive descent parser drives a train through railroad syntax diagrams.
  482. 482 Water Economy SimulationA glass-and-brass hydraulic computer where water is money and valves are policy.
  483. 483 Wandering Dunes NatureCrescent dunes march across a desert, built by a three-rule sand slab model.
  484. 484 Circle Packing MathThurston's discrete Riemann map: a live circle packing warps a picture into your blob.
  485. 485 Twinkle AstronomyTurbulent air boils a star into speckles until adaptive optics snaps it sharp.
  486. 486 Spinning Tops PhysicsRigid-body tops precess, wobble and clash in a steel dish, then topple as they slow.
  487. 487 Mondrian Forest Machine learningDecision trees cut the plane into a De Stijl painting; a forest blurs it into glazes.
  488. 488 Tiny Compiler AlgorithmsA whole compiler, from source to running bytecode, rebuilt on every keystroke.
  489. 489 Sundial Garden 3DA pastel garden lit by the real sun, with shadow-mapped shadows and a working sundial.
  490. 490 Dissonance Curve SoundPlomp-Levelt roughness summed over every partial pair: where consonance comes from.
  491. 491 Viscous Fingering FluidsAir forced into honey between glass plates splits into branching fingers.
  492. 492 Lateral Inhibition IllusionsFour brightness illusions, each predicted live by a model of retinal ganglion cells.
  493. 493 Lichen Generative artA century of lichens colonizing a granite boulder, as a time-lapse you can scrub.
  494. 494 Watch Movement PhysicsAn exploded mechanical watch whose Swiss lever escapement is simulated, not animated.
  495. 495 Line Breaking Type and imageGreedy line breaking versus Knuth-Plass, with rivers and the breakpoint graph.
  496. 496 Chord Orbifold MathTymoczko's geometry of chords: a twisted prism and a Mobius strip you can hear.
  497. 497 Lava Island NatureA volcanic island erupts at dusk, and every lava flow cools into new land.
  498. 498 Fire and Regrowth EmergenceA watercolor forest that burns and regrows into a power law, untuned.
  499. 499 Star Cluster Ages AstronomyA star cluster and its HR diagram age side by side across 13 billion years.
  500. 500 Nonogram Forge AlgorithmsPaints a pixel picture, proves its clues have one answer, then solves it line by line.

Every demo is a single JavaScript module drawing into a 2D canvas, with source you can read from its page. The prompts are deliberately simpler than the demos: they get Claude Code, Codex or any coding agent to a satisfying first version you can grow from there.

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