write a story about a grain of sand as it watches millions of years go by

The grain of sand did not know it was small.

At first, it was part of a mountain, and the mountain occupied the whole world.

There was the dark warmth of stone on every side. There was pressure. There were slow movements that would have been terrible had they happened quickly, but they happened over such long stretches of time that the grain knew them only as a change in the way it was held.

Then water found a crack.

Winter widened it. Roots entered, thickened, died. One spring, a slab of the mountain broke away and fell into sunlight.

For the first time, the grain saw the sky.

It was larger than the mountain.

A river taught the grain to travel.

The journey was not graceful. The grain struck other stones, caught in crevices, lay still for centuries, then lurched forward in a flood. Its sharp corners wore away. Pieces of the mountain that had once pressed close beside it became strangers, then disappeared.

Above the river grew trees unlike any that would grow there again. Huge animals came to drink. Their feet stirred the mud, and their reflections shivered across the grain.

It could not see an entire animal at once. It saw a leg like a moving tree trunk, a belly passing over the water, a long neck bending toward its own wavering image.

One afternoon, a small feather floated down and settled on the river.

The grain watched it drift away.

Of all the things it had encountered, the feather seemed the least likely to last.

The river delivered it to the sea.

Here, motion had a rhythm. Forward, backward. Forward, backward. The grain rolled up a beach and slipped down again. Shells accumulated around it. Some were no larger than the grain itself; others curved above it like pale roofs.

Days passed in light and darkness.

Years passed in storms.

The sea advanced. The beach vanished beneath deeper water, and the grain settled where the waves could no longer reach it.

Fine mud fell.

It fell so slowly that a creature could have lived and died between one settling particle and the next. The grain was covered, uncovered by something burrowing, then covered again.

One day, a strange dust descended through the water.

Far away, something had struck the Earth.

The grain did not see the impact. It felt no sudden understanding that an age had ended. It knew only the unfamiliar dust, the long dimness, and, afterward, the absence of certain small shells that had always drifted down from above.

The mud kept falling.

Burial was a return to darkness, but not to the old mountain.

This time, the grain lay among strangers.

Water moved between them, leaving minerals behind. Slowly, the spaces closed. The grains became sandstone.

They rested together beneath the weight of a vanished sea.

Above them, layers gathered. Continents moved. The ocean floor rose until it was no longer ocean floor, though the grain could not have known this. It knew only that the weight changed and that, after a very long time, the stone around it began to bend.

A crack opened nearby.

Water entered.

The grain recognized water.

Its second sight of the sky came from the face of a cliff.

Below lay a plain of grass. Animals with hair grazed there in herds, lifting their heads together when something moved beyond the grain’s view.

The sky was still larger than everything.

For thousands of years, the grain remained fixed in the cliff. Rain darkened its little window. Sun warmed it. A bird nested on a ledge nearby, returning with grass and scraps of fur.

The bird lived one summer.

Or perhaps many birds came, so alike that the grain could not distinguish them.

This was a difficulty with living things. They arrived with such conviction. They built, hunted, sang, defended a patch of air or earth as though it had always belonged to them.

Then they were gone.

Yet there was nearly always another.

Ice came down from the hills.

It filled valleys, flattened forests, and climbed against the cliff. The grain, loosened by frost, broke free into a pale blue world.

For a long time it traveled in the glacier’s underside, scraping across bedrock. Around it were stones from places it had never seen.

Then the ice melted.

There was a furious summer of water.

The grain went tumbling through another river, past banks where flowers opened in soil that had lately been beneath a weight of ice. It rested in a gravel bed. A flood took it farther. A lake held it for a while.

Eventually, it reached another shore.

This sea smelled different, though the grain had no name for smell. The water was full of different creatures. The shells had changed.

The waves had not.

Forward, backward.

Forward, backward.

One morning, a shadow fell across the beach.

A child crouched beside the grain and pushed a red bucket into the sand.

The grain rose.

After mountains and rivers, burial and ice, it found itself packed into the wall of a castle.

There were four towers. A crooked moat. A passage made with two fingers.

The child decorated the tallest tower with a white shell and sat back to admire it.

For an afternoon, the grain looked out over a kingdom.

People passed carrying shoes. A dog dug a hole. Farther down the beach, another child cried and was comforted. The sun moved toward the water.

When the first wave reached the moat, the child leaned forward.

“No,” she said.

She scooped wet sand into the breach. She built a wall in front of the wall.

The next wave was larger.

The grain felt the tower loosen.

For the first time in all its long existence, someone was trying to keep it where it was.

But the sea came in, and the castle fell.

The child stood for a moment with the empty bucket in her hand. Then someone called her name, and she ran up the beach.

The grain settled beneath a thin sheet of water.

Above it, the white shell rocked gently in the current. Beyond that, the child’s footprints filled, one by one.