Do Not Enter. Exploration into his own mind was as dangerous as a journey to—what? He couldn't find an analogue, though he suspected that many existed. I must have been sick. That was the only reasonable explanation. He was a man with the recollection of memories. He must at one time have had that priceless wealth of recall which now he could only deduce from the limited evidence at his disposal. At one time he must have had specific memories of birds, trees, friends, family, status, a wife perhaps. Now he could only theorize about them. Once he had been able to say, this is like, or, that reminds me of. Now nothing reminded him of anything, and things were only like themselves. He had lost his powers of contrast and comparison. He could no longer analyze the present in terms of the experienced past. This must be a hospital. Of course. He was being cared for in this place. Kindly doctors were working to restore his memory, to replace his identity, to restore his judgment apparatus, to tell him who and what he was. It was very good of them; he felt tears of gratitude start in his eyes. He stood up and walked slowly around his small room. He went to the door and found it locked. That locked door gave him a moment of panic which he sternly controlled. Perhaps he had been violent. Well, he wouldn't be violent any more. They'd see. They would award him all possible patient privileges. He would speak about that with the doctor. He waited. After a long time, he heard footsteps coming down the corridor outside his door. He sat on the edge of the cot and listened, trying to control his excitement. The footsteps stopped beside his door. A panel slid open, and a face peered in. "How are you feeling?" the man asked. He walked up to the panel, and saw that the man who questioned him was dressed in a brown uniform. He had an object on his waist which could be identified, after a moment, as a weapon. This man was undoubtedly a guard. He had a blunt, unreadable face. "Could you tell me my name?" he asked the guard. "Call yourself 402," the guard said. "That's your cell number." He didn't like it. But 402 was better than nothing at all. He asked the guard, "Have I been sick for