There was once a traveller who came to a town where every wall was a mirror. Not glass — something older, that gave back not the face but the feeling behind it. She walked in scowling from the road, and the town scowled back: doors shut as she passed, prices rose, dogs barked. She stayed a night in the only inn that would take her and lay awake furious at the place. In the morning, tired of fury, she smiled at the innkeeper only because she had nothing left. The innkeeper smiled. The dog wagged. The bread was warm. She understood nothing yet. She only noticed that the town had changed overnight and she had not moved.

On the first wall, in letters worn soft, someone had carved a single line: You exist. The traveller laughed — of course she did. But the wall did not mean it as a greeting. It meant it as the ground. Whatever she feared losing, whatever she thought she had to earn, sat on top of a fact that could not be taken: she was. She had always been. She would always be, in some form or other. She stood there longer than she meant to. It was strange how much lighter a fear becomes when you remember it's standing on something that can't fall.

The second wall had a clock on it with no hands. The traveller asked a child what time it was. 'Now,' the child said, as if it were obvious. 'It's always now. My mother says the past is just now, remembering, and the future is now, imagining.' The traveller thought of the years she'd spent living in rooms that didn't exist yet — the argument she'd have next week, the day she'd finally be ready. All of it had happened here. In the only place anything happens. She put her hand on the handless clock and felt, faintly, that it was warm.

The third wall was a single mirror broken into a thousand pieces, and every piece held the whole town. The traveller picked one up. In it: the inn, the road, the child, herself picking up a piece of mirror that held the inn, the road, the child. 'Every fragment holds the entire image,' said an old man sweeping the square. 'That's not a trick of the glass. That's what you are.' She looked at him. He looked exactly like everyone she had ever met, which is to say he looked like a person, which is to say she was looking at herself from an angle she'd never been given.

The fourth wall was the one she'd already met on her first night, though she hadn't known it. It said: physical reality is a mirror. It will not change until you do. She thought of every morning she had waited for the day to be kind before she would be. She had been standing in front of a mirror telling it to smile first. It never had. It never would. It wasn't cruel. It was honest. The town had not been hostile on her first night. It had been accurate.

The fifth wall was blank. 'That one changes,' the child explained. 'Every day it says something different. Yesterday it said fire. Once it said my name.' The traveller asked how a law could be a law if it changed. The child thought about it and said, 'Everything changes. That's the law. The only things that don't change are the four you already read. And when change changes — what does it become?' She didn't have an answer. The child did: 'It becomes the ones that don't.' A circle, then. Four steady stones and one river, and the river is what makes the stones visible.

A woman at the market sold compasses that pointed at nothing. 'They point at what excites you most,' she said. 'Right now, in this moment. Not what you should want. What actually lifts.' The traveller held one and felt it swing toward a doorway she had no reason to enter. 'Go,' the woman said. 'Take it as far as it goes. And don't insist on what's behind the door. The excitement might only be there to get you walking. What actually needs to happen might be somewhere along the way.' She went through the door. Behind it was a staircase. At the top was a view she had not known she was looking for.

At the edge of the town was a station where trains left constantly, on tracks that ran side by side and then, slowly, apart. 'You can still step across,' said the stationmaster, 'while they're close. Later it's harder.' People stood on the platform arguing over which train was real. Both were. That was the thing nobody wanted to hear. 'The first sign,' the stationmaster said, 'is that everyone is telling the truth as they see it, and the truths don't match anymore. That's not a lie. That's two worlds, still in one station.' The traveller boarded the one she preferred. She did not argue with anyone about it.

On the far side of the town stood a ruin, and beside it a building still being built. 'That's how it used to go,' the old man said of the ruin. 'Create, keep, destroy. Then start again from nothing. A hard reset.' And the new building? 'Create, keep, expand. When the old one can't hold anymore, you don't burn it. You step sideways into the next version. The seams split, and what's outdated falls away — not as an ending, as an opening.' The traveller looked at the ruin and the building and understood she was standing in the year the method had changed.

On her last morning the traveller went back to the first wall to say goodbye, and found her own face in it — not her feeling, her face. 'It shows you that at the end,' the child said, 'once you've read the others.' She understood. There had been no town. There had been a mirror large enough to walk around inside, built so that she could finally see the one who had been putting things out all along. She walked back onto the road smiling, and the road, of course, smiled back. It had been waiting to.