Jeserac had told him flatly that he knew no road out of Diaspar, and doubted if one existed. The information machines, when Alvin had questioned them, had searched their almost infinite memories in vain. They could tell him every detail of the city’s history back to the beginning of recorded times-back to the barrier beyond which the Dawn Ages lay forever hidden. But they could not answer Alvin’s simple question, or else some higher power had forbidden them to do so.

He would have to see Khedron again.

«You took your time,» said Khedron, «but I knew you would call sooner or later.»

This confidence annoyed Alvin; he did not like to think that his behavior could be predicted so accurately. He won-dered if the Jester had watched all his fruitless searching and knew exactly what he had been doing.

«I am trying to find a way out of the city,» he said bluntly. «There must be one, and I think you could help me find it.»

Khedron was silent for a moment. There was still time, if he wished, to turn back from the road that stretched be-fore him, and which led into a future beyond all his powers of prophecy. No one else would have hesitated; no other man in the city, even if he had the power, would have dared to disturb the ghosts of an age that had been dead for millions of centuries. Perhaps there was no danger, perhaps nothing could alter the perpetual changelessness of Diaspar. But if there was any risk of something strange and new coming in-to the world, this might be the last chance to ward it off.

Khedron was content with the order of things as it was. True, he might upset that order from time to time but only by a little. He was a critic, not a revolutionary. On the placidly flowing river of time, he wished only to make a few ripples: he shrank from diverting its course. The desire for adventure, other than that of the mind, had been eliminated from him as carefully and thoroughly as from all the other citizens of Diaspar.

Yet he still possessed, though it was almost extinguished, that spark of curiosity that was once Man’s greatest gift. He was still prepared to take a risk.

He looked at Alvin and tried to remember his own youth, his own dreams of half a thousand years before. Any moment of his past that he cared to choose was still clear and sharp when he turned his memory upon it. Like beads upon a string, this life and all the ones before it stretched back through the ages; he could seize and re-examine any one he wished. Most of those older Khedrons were strangers to him now; the basic patterns might be the same, but the weight of experience sepa-rated him from them forever. If he wished, he could wash his mind clear of all his earlier incarnations, when next he walked back into the Hall of Creation to sleep until the city called him forth again. But that would be a kind of death, and he was not ready for that yet. He was still prepared to go on collecting all that life could offer, like a chambered nautilus patiently adding new cells to its slowly expanding spiral.

In his youth, he had been no different from his companions. It was not until he came of age and the latent memories of his earlier lives came flooding back that he had taken up the role for which he had been destined long ago. Sometimes he felt resentment that the intelligences which had contrived Diaspar with such infinite skill could even now, after all these ages, make him move like a puppet across their stage. Here, perhaps, was a chance of obtaining a long-delayed revenge. A new actor had appeared who might ring down the curtain for the last time on a play that already had seen far too many acts.

Sympathy, for one whose loneliness must be even greater than his own; an ennui produced by ages of repetition; and an impish sense of fun-these were the discordant factors that prompted Khedron to act.

«I may be able to help you,» he told Alvin, «or I may not. I don’t wish to raise any false hopes. Meet me in half an hour at the intersection of Radius 3 and Ring 2. If I cannot do anything else, at least I can promise you an interesting journey. Alvin was at the rendezvous ten minutes ahead of time, though it was on the other side of the city. He waited impatiently as the moving ways swept eternally past him, bearing the placid and contented people of the city about their unimportant business. At last he saw the tall figure of Khe-dron appear in the distance, and a moment later he was for the first time in the physical presence of the Jester. This was no projected image; when they touched palms in the ancient greeting, Khedron was real enough.

The Jester sat down on one of the marble balustrades and regarded Alvin with a curious intentness.

«I wonder,» he said, «if you know what you are asking. And I wonder what you would do if you obtained it. Do you really imagine that you could leave the city, even if you found a way?»

I am sure of it,» replied Alvin, bravely enough, though Khedron could sense the uncertainty in his voice.

«Then let me tell you something which you may not know. You see those towers there?» Khedron pointed to the twin peaks of Power Central and Council Hall, staring at each other across a canyon a mile deep. «Suppose I were to lay a perfectly firm plank between those two towers-a plank only six inches wide. Could you walk across it?»

Alvin hesitated.

«I don’t know,» he answered. «I wouldn’t like to try.»

«I’m quite sure you could never do it. You’d get giddy and fall off before you’d gone a dozen paces. Yet if that same plank was supported just clear of the ground, you’d be able to walk along it without difficulty.»

«And what does that prove?»

«A simple point I’m trying to make. In the two experiments I’ve described, the plank would be exactly the same in both cases. One of those wheeled robots you sometimes meet could cross it just as easily if it was bridging those towers as if it was laid along the ground. We couldn’t, because we have a fear of heights. It may be irrational, but it’s too powerful to be ignored. It is built into us; we are born with it.

In the same way, we have a fear of space. Show any man in Diaspar a road out of the city-a road that might be just like this road in front of us now-and he could not go far along it. He would have to turn back, as you would turn back if you started to cross a plank between those towers.»

«But why?» asked Alvin. «There must have been a time-»

«I know, I know,» said Khedron. «Men once went out over the whole world and to the stars themselves. Something changed them and gave them this fear with which they are now born. You alone imagine that you do not possess it. Well, we shall see. I’m taking you to Council Hall.»

The Hall was one of the largest buildings in the city, and was almost entirely given over to the machines that were the real administrators of Diaspar. Not far from its summit was the chamber where the Council met on those infrequent oc-casions when it had any business to discuss.

The wide entrance swallowed them up, and Khedron strode forward into the golden gloom. Alvin had never entered Coun-cil Hall before; there was no rule against it-there were few rules against anything in Diaspar-but like everyone else he had a certain half-religious awe of the place. In a world that had no gods, Council Hall was the nearest thing to a temple.

Khedron never hesitated as he led Alvin along corridors and down ramps that were obviously made for wheeled ma-chines, not human traffic. Some of these ramps zigzagged down into the depths at such steep angles that it would have been impossible to keep a footing on them had not gravity been twisted to compensate for the slope.

They came at last to a closed door, which slid silently open as they approached, then barred their retreat. Ahead was another door, which did not open as they came up to it. Khedron made no move to touch the door, but stood motionless in front of it. After a short pause, a quiet voice said: «Please state your names.»