He shook his head again, peered again into the distance. The narrow space between floor and ceiling vanished, all around, into a thin line, hazed by distance. The line looked very slightly curved, like a horizon of empty water seen from a ship on a planetary ocean. He felt dizzy again. His eyes could not accept it; his brain took in the short space between floor and ceiling and so expected walls, expected a room-space. But if he was in a room (and if this was not some sort of projection, or even some unsubtle trick with mirrors) then its walls appeared to be somewhere over the horizon. He turned again, carefully, trying to recall his early training for the Wars, which had included balance and disorientation exercises that had left him feeling a bit like he did now, and looked again at the black wall just behind him, with the metal-strapped door in it. He looked along the very slightly curved wall, trying to estimate the diameter of the circle it implied. It must be several kilometres; sufficient to encompass the castle, mines and quarries. This wall was the castle's root, its foundation. This endless space some sort of vast basement.

"What is this place?" he said, and felt as though he was whispering; his brain expected echoes, but none came. It was like speaking in the open air. He looked round at the people stood on stools and slumped in tall chairs as the red crow said, "Let's take a walk. Follow me and I'll tell you." It flapped slowly past him, and he walked slowly after it. He passed near one of the standing figures: a man, dressed in furs similar to his own, but older-looking. The man looked skinny. A pipe led from the furs round the man's crotch to a stone jug on the floor. They passed him by. Some movement, far in the hazy distance, attracted Quiss's eyes. It looked like a small train; a narrow-gauge railway with a small locomotive on it, hauling hopper-like carriages. It was difficult to estimate the distance, but he guessed it was at least four hundred metres away, moving out from the castle, away into the thin space of standing people and supporting columns. He remembered the train he had seen, long ago, in the kitchens.

He looked round, trying to estimate the density of people in the place. There seemed to be about one person per ten metres square. Fascinated, he stared at them, seeing hundreds, thousands of them. If the density was the same throughout the space he could make out in the dim haze of distance before floor and ceiling seemed to meet, then there must be ...

"It has no name," the red crow said, flapping in front of him, facing away from him, its voice far away. Technically I believe this is part of the castle. It may even be thought of as the basement." Its voice became a chuckle for a moment. "I have no idea how large this place is. I have flown for ten thousand wingbeats in many directions and not even seen a wall. It is all very, very uniform. Apart from a greater concentration of railway lines in the floor, what you see here is what you would see anywhere, in any part of it. There must be many tens of millions of people here, with their heads stuck inside the ceiling, in these reverse goldfish-bowls."

Quiss didn't know what a goldfish-bowl was, but he thought it best to feign ignorance of what these people were doing with their heads stuck in the ceiling. He asked the crow about this.

"There is a type of animal which sits over the hollow glass semi-sphere the people have their heads inside," the red crow said. "The animal translates thoughts through time. Each of these people is inside the head of a human being from the past."

"I see," Quiss said, hoping he sounded more blase than the red crow expected. "The past, you say?" He scratched his chin. He still could not believe what his eyes told him; he was walking forward, not bumping into anything, but some part of him still expected to hit a projection screen or wall.

The red crow turned easily in the air in front of him, so that it was now flying backwards, something it appeared to do with the same facility with which it flew forwards, or smoked a cigar. "You haven't guessed, have you?" it said to him. There was a smirk in its voice, if not on its expressionless face. Iron reinforcing bands in the ceiling cast bands of shadow over the slowly flapping red wings.

"Guessed what?"

"Where this is. Where you are. The name of this place."

"Where? Tell me, then," Quiss said, and stopped walking. The small train had disappeared in the distance. He thought he could just hear it, though; rails singing. A whisper of that noise seemed to fill this place, like low voices.

"Hmm," the crow said, "well, you may not have heard of it; even at the times of the Therapeutic Wars the memory was being lost well, anyway. This is, as you might have guessed, a planet. Its name is Earth."

Quiss nodded. Yes, that made more sense that what the small attendant had told him in the room he had found his way into. "Dirt', indeed!

"That is the name of this place; that is where the castle is; on Earth, towards the end of the planet's life. In a few hundred million more years the sun will become a red giant, engulfing the inner planets of its system. In the meantime, with no moon anymore, and having stopped wobbling and spinning, with only the castle, as far as I know, on the surface and all trace of previous civilisations and the species of humankind just weathered away or ground beneath continental plates a billion years ago, this is your inheritance."

"Mine?" Quiss said. He looked about. Some distance behind him, the gentle curvature of the castle's base-wall was more evident than it had been closer to.

"This," the red crow said "is one of two fates that wait you. If you want, you can join these people; become one of them, dreaming of a past time, within the body of whoever they choose, billions upon billions of years ago."

"Why should I want, or not want that?"

"You might want it because you do not wish to die now. You may not want it because you have what they sometimes call a civilised consciousness. You see, each of these people has tried and failed to do what you and your lady-friend are trying - and will fail - to do; escape. Every one of them, all these millions of individuals, is a failure. Each one has given up trying to answer the riddle they were set, and while others have chosen oblivion, these have chosen to live out what time they have left as parasites, in the minds of others in forgotten times. They experience what others have experienced, they even have the illusion of altering the past, so that they seem to exercise free will, and apparently influence what their hosts do. It is to delay death, to turn to something like a drug, to turn away from reality, to refuse to face one's own defeat. I have heard it said that this is better than nothing, but..." the creature's voice trailed off. Its beady eyes stayed fixed on Quiss.

"I see," he said. "Well, I must say I don't find it all that depressing."

"Perhaps you will, though, later."

"Perhaps," Quiss said, and did his best to assume a nonchalant air. "Do I take it that these people have to be fed, and that the castle kitchens are as large and as busy as they are because they must cater for them?"

"Oh well done," the red crow said, only a little sarcastically. "Yes, they run little trains from the kitchens, full of soups and gruels, to the furthest points of the place, wherever those may be; some trains get lost for years, others never return. Luckily these failed unfortunates need little in the way of nourishment, so the easily kitchens can just about cope, though even so they couldn't do it if they didn't mess around with subjective time... For all I know this universal basement extends right round the planet, and the castle supplies all those people; or perhaps there are other castles; one does hear rumours. Well, the castle feeds all the people you see, at any rate. They're eased out of the head-hole and given a bowl to sup from; they sit there with empty eyes, as though asleep, drink or sup, then like zombies go back to their own little world again. Their wastes are taken away in the same trains." The red crow cocked its head, and its voice sounded almost puzzled: "But don't you find this all rather... sapping? This is what awaits you, man. This is where almost all of them end up, and a lot of them were a lot brighter than you. Ask the seneschal, if you like. He will confirm what I say. Very few escape. Virtually none."