Write a story about the first person to build a telescope and the moment she raises her potent creation to the sky and sees the stars for what they truly are.

When Ilyra was nine, her father told her the stars were holes in the roof of the world.

“Beyond it burns the everlasting fire,” he said. “The holes let a little mercy through.”

He was a glazier. All day he fitted colored panes into the windows of the temple, making the saints blue and the martyrs red. At night he came home with bright splinters in his cuffs. Ilyra picked them out before her mother washed his shirts.

“Who made the holes?” she asked.

“God.”

“Why are they different sizes?”

Her father looked up from his soup.

“Perhaps some things took more mercy.”

She accepted this for almost twenty years.

The instrument began with a mistake.

A merchant had ordered a lens to enlarge the lettering in his account books. Ilyra ground it too thin at the center, and when she held it over a page, the figures shrank.

She put it aside. Good glass cost too much to throw away.

Months later, cleaning the workbench, she lifted the spoiled lens in one hand and a finished magnifier in the other. Through the two pieces of glass, the weathercock on the customs house leaped toward her.

She dropped one lens.

It broke.

For a long time she stood among the fragments, staring at the little brass bird three streets away.

Then she locked the shop.

For eleven days, customers knocked and received no answer. Ilyra ate bread with grinding powder on her fingers. She slept on the floor beside the furnace. She made lenses that turned the world yellow, lenses that doubled it, lenses through which everything wore a violet wound.

When at last she found the right pairing, she fitted the glass into a tube made from thin strips of cedar, bound it with wire, and lined it with black cloth cut from her winter coat.

Through it she could count the nails in the customs-house door.

She could see a sailor on a ship beyond the harbor wall threading a needle. She watched him miss twice, lick the thread, and try again.

She laughed aloud.

Here was a thing no one had ever possessed: distance, brought within reach.

For the rest of that day she pointed her instrument at steeples, chimneys, birds. She read the name of a vessel too far away to have arrived. She discovered that the stone angel above the courthouse had a nest beneath its wing.

Only when the shop darkened did she think of the sky.

Her father had been dead six years. His ladder still stood in the courtyard.

Ilyra carried it upstairs, pushed open the roof hatch, and climbed into the cold with the instrument strapped across her back.

Above the city hung the moon, almost half full.

She had expected brightness. Perhaps a smoother whiteness, enlarged.

Instead she found a country.

Her breath stopped against the eyepiece.

The moon’s illuminated edge was jagged. Dark hollows lay inside rings of light. Near the boundary of night, bright peaks stood alone in the blackness, catching sunlight while the land beneath them remained dark.

She knew that sight.

Every winter, before sunrise, the mountains east of the city looked exactly so.

She lowered the tube.

The moon returned to its familiar place: a pale emblem above the temple dome.

She raised it again.

Mountains.

Not a mark painted upon heaven. Not a flawless lamp.

There was ground up there.

She sat down hard on the roof tiles.

For a while she could do nothing but hold the instrument across her knees. Somewhere below, a woman called a child indoors. A cart rattled over the square. The ordinary noises continued, though Ilyra felt they ought to have changed.

Then she stood.

She turned the tube toward the white haze that crossed the sky.

The priests called it the Seam, where the two halves of the firmament had been joined. Her father had once compared it to the solder between panes.

Through her glass, the seam came apart.

Stars.

So many that at first she thought there was dust on the lens.

She wiped it with her sleeve and looked again.

More stars than she had seen in all the nights of her life crowded into that narrow circle. Bright ones, faint ones, others barely present. Wherever she moved the tube, more appeared.

She searched for a place where they ended.

The cedar creaked in her tightening hands.

All her life the stars had belonged to a surface. They hung above the world as nails hung above a workbench: some higher, some lower, all fastened to the same wall.

Now she could no longer find the wall.

She looked until her eye watered. The stars did not swell into landscapes as the moon had. Most remained sharp points, keeping their distance even from this hungry arrangement of glass.

How far away must a fire be, she wondered, to defeat such an instrument?

And then she thought of the sun.

She did not see the answer through the lens. It arrived while she was looking, which was different, and she would spend years learning how much that difference mattered.

A sun, carried far enough away, might become a point.

Farther still, it might become one of those faint lights she could scarcely hold in sight.

Ilyra lowered the instrument slowly.

There were fires beyond counting.

The world had no roof.

Fear came first.

Without a roof, what sheltered them? What kept the dark from going on forever?

She wanted, suddenly and fiercely, her father. She wanted him alive on the ladder, settling a pane into its leaden frame, certain that everything had an edge and a place to fit.

Then she remembered the sailor trying to thread his needle.

At a distance, a ship became a speck. Closer, it became timber and rope and a man with a small, irritating task.

What might these lights become if she could get close enough?

She looked again.

For the first time, she tried to imagine the sun from elsewhere: a modest star in an unfamiliar sky. Beneath it, too far away to be seen, were the harbor, the customs house, her father’s grave. Here was the roof where she stood, with a piece missing from her coat and glass dust in the creases of her hands.

Nothing had vanished because it was small.

She stayed until dawn.

In the morning she went downstairs and opened the shop.

She set the instrument on the counter. Beside it she laid a sheet of paper and wrote:

Mountains on the moon.

Then:

The Seam is made of stars.

She hesitated over the next line.

At last she wrote:

The stars may be suns, at distances I do not know how to measure.

That sentence pleased her most. There was room in it to work.

When the baker came in to collect his repaired spectacles, he found her asleep at the counter, her cheek beside the page.

He woke her gently.

“What is that thing?”

Ilyra lifted her head. Morning filled the workshop windows. In the light, her magnificent creation looked like what it was: cedar, wire, two imperfect pieces of glass.

“Come back tonight,” she said.