There was no one in the corridor. He found a window and stared out of it. There was Tylerton—an ersatz city, but looking so real and familiar that Burckhardt almost imagined the whole episode a dream. It was no dream, though. He was certain of that in his heart and equally certain that nothing in Tylerton could help him now. It had to be the other direction. It took him a quarter of an hour to find a way, but he found it—skulking through the corridors, dodging the suspicion of footsteps, knowing for certain that his hiding was in vain, for Dorchin was undoubtedly aware of every move he made. But no one stopped him, and he found another door. It was a simple enough door from the inside. But when he opened it and stepped out, it was like nothing he had ever seen. First there was light—brilliant, incredible, blinding light. Burckhardt blinked upward, unbelieving and afraid. He was standing on a ledge of smooth, finished metal. Not a dozen yards from his feet, the ledge dropped sharply away; he hardly dared approach the brink, but even from where he stood he could see no bottom to the chasm before him. And the gulf extended out of sight into the glare on either side of him. o wonder Dorchin could so easily give him his freedom! From the factory, there was nowhere to go—but how incredible this fantastic gulf, how impossible the hundred white and blinding suns that hung above! A voice by his side said inquiringly, "Burckhardt?" And thunder rolled the name, mutteringly soft, back and forth in the abyss before him. Burckhardt wet his lips. "Y-yes?" he croaked. "This is Dorchin. Not a robot this time, but Dorchin in the flesh, talking to you on a hand mike. Now you have seen, Burckhardt. Now will you be reasonable and let the maintenance crews take over?" Burckhardt stood paralyzed. One of the moving mountains in the blinding glare came toward him. It towered hundreds of feet over his head; he stared up at its top, squinting helplessly into the light. It looked like— Impossible!