"One," said Jerry, stepping out toward that blinding coruscation of heat. "Two," he said, feeling carefully for the next girder. Then the toe of his boot slipped from the metal, and he realized, with a horrible lancing of adrenalin through his abdomen, that he was falling out the opening between the girders. The only salvation would be a shove with his still-braced rear foot, but that would carry him directly into the inferno of burning fuel. An eternity of falling through icy vacuum against an instant of intolerable searing pain.... "The fire—" gasped Jerry, toppling in inexorable slow motion toward starry darkness, a cloud of twirling chess pieces orbiting about his head. "I've got to make it into the fire...." He tensed the muscles of the laggard leg for the spring that would carry him to destruction, and then he saw that the chess pieces were shimmering gray, and the oval frame of the doorway to the flaming fuel was shimmering gray, and even what had seemed hot white burning was cold gray waiting mist, and with a yell of remembrance, Jerry clamped shut his eyes and let himself plunge downward into nothingness.... III "Are you all right, Norcriss?" Jerry blinked slowly, then focused on the face of Dr. Alan Burgess. He found himself lying on a narrow, white-sheeted cart, in the corridor outside the room where all the trouble had begun. "Mawson," he said groggily. "Is he—?" Burgess nodded wearily. "Still in there, in full control of his one-man universe. What happened, Norcriss? You came tumbling out that door like a wild man, clawing the air and yelling. Then you went into shock. You've been unconscious for two hours." "I—I thought I was falling," Jerry admitted. "The last thing I remember is stepping through the open space between a spaceship's supporting girders." "What open space?" said Burgess, frowning curiously. Jerry shook his head. "There isn't any such thing. But something happens to logic in that room. It's like having a dream, Doctor. Things that would startle you in everyday life seem correct. Even familiar. But there's a kind of pattern to events. At first, I'm in my universe, and mostly in control. Then little fragments of my pseudo-reality start slipping, changing into other things. The changes seem perfectly normal to me. Then, all at once, the guy with the brass buttons turns up—and I've managed in the nick