Below Alpharon's terraces lies a sea of cloud, pale at dawn, amber at dusk, silver under the moon. The old ground is still down there, under the cloud, but nobody in the city goes down to it for pleasure, and most people never go at all. On the rare mornings when the tide runs low, the tips of old towers show through, and the ferrykeepers lower their lanterns to look. Some say the towers are only empty. Some say they are not. The terraces have a rule for the question: you may wonder aloud, but you may not argue about it at the table.
A terrace is never built by one hand. A household adds a balcony to the spire, a neighbour adds a stair, and the spire grows the way a coral grows, one small decision at a time. Each addition must carry a lantern, and each lantern must have a name painted on its base. Walk any spire at dusk and you can read its history in the names: the first lantern is usually called Welcome, the last is usually called Enough.
Every dusk the wardens climb the spires with long poles and light the lanterns, one terrace at a time. They are not employed by anyone. The work passes from person to person, usually without a word: someone leaves a pole by your door, and the next evening you are a warden. The old wardens say the light is only kept, never made, and that a warden's real job is to notice when a terrace has gone dark and to knock on the door.
The oldest craft in Panthassia is keeping light. A lanternwright cannot make light, but she can catch it: the last gold of a good afternoon, the green of a clear dawn, the blue of a quiet hour. Caught light is poured into glass and sealed with a thread of beaten gold, and it will glow for as long as it is looked after. Every lantern wants a name and a keeper. A lantern that is never named burns pale and short, and nobody can say why.
At the turn from gold to blue, the terraces fall silent. It is not a law. Doors close softly, the ferry bells are muffled with cloth, and even the couriers walk instead of run. People say the quiet hour is when the city listens to the cloud sea, and that the sea answers, very faintly, in a low note that you feel in the railings. Visitors who laugh at the custom are never scolded. They are simply handed a cup of tea and left to hear it for themselves.
Between the spires run small lantern-lit ferries on cables of braided light and steel. Each ferry has a keeper who knows every regular by name and every stranger by the way they hold the rail. The ferrykeepers keep one seat empty on every crossing, and nobody remembers why. The east landing tells a story of a last ferry that never docked, and of a lantern left burning in the ticket office window in case it still might.
Walk any terrace and you will find a balcony with a chair, a lantern and nobody in it. These are left empty on purpose. The custom says every spire must keep a place for someone who has not arrived yet, and that the lantern must be lit every dusk as if they might come tonight. Many do arrive, years later, tired and a little embarrassed, to find a lit lantern, a clean chair, and a neighbour already putting the kettle on.
Light in Panthassia is taxed. The Exchange, an old guild of lamp-brokers, holds the rights to every public lantern above the cloud line and collects a tithe from each household that wants a dusk. The tithe is small. It is always small, and it has never once been lowered. Those who fall behind are not fined. Their terrace is simply dimmed: a quiet notice on the door, and then a quiet dark. The wardens say a dimmed terrace is how you find out who your neighbours are, because the first knock at dusk is never from the Exchange.
A grey lantern burns without a name. The Exchange makes them by the thousand and sells them as the sensible choice: cheap, bright, guaranteed for a year, and no keeper needed. They do not fade because nobody cares for them. They fade because they were made to. Spires that fill with grey lanterns grow strangely tidy and strangely lonely. Old keepers can pick a grey spire out from across the cloud: the light is level, the colour is slightly wrong, and nothing in it has ever been waited for.
The year the Exchange dimmed the whole of the Ninth Spire in a single evening, three hundred people were left on cold terraces with nothing to see by. By midnight the ferries were crowded, and every ferry carried the same cargo: lanterns, lent. Nobody organised it. Households from forty spires sent one lantern each, unnamed on the ferry and named at the other end. The Ninth Spire has not been dimmed since. The Exchange maintains that the story of what happened next, a letter, a ledger, a door in the Exchange hall found open, is untrue. Nobody at the Exchange will say what the letter said.
The Exchange keeps a ledger of every household in the cloud, and a second one that nobody has seen. The first lists what you owe. The second, the clerks whisper, lists what you have been seen doing. Neither is ever shown to the people it describes. Pages of the second have been leaked more than once, and each time it ended the same way: the pages were genuine, the person who leaked them was gone by morning, and at the next dusk a new lantern appeared on the nearest terrace with a name painted on its base that no one would say aloud.
A weather-reader is not a forecaster. A forecaster tells you what the sky will do; a reader tells you what it wants. Readers are rare, slightly unsettling and quietly expensive, and the Exchange has twice tried to license them. Both attempts failed in the same way: the licensed readers were wrong, often and unmistakably, for as long as they were licensed, and the unlicensed ones were right. One of them was once asked how. She said only that the sky does not like being counted.