It was the port.
Hoskins wiped sweat away from his upper lip and stood blinking into the airlock until the outer port opened as well. Warm afternoon sunlight and a soft, fresh breeze poured in. In the wind was birdsong and the smell of growing things. Hoskins gazed into it, his mild eyes misty. Then he turned back to the cabin.
The darkness was gone. Ives was sprawled on the after couch, apparently unconscious. Johnny was smiling in his sleep. The Captain was snoring stertorously, and Paresi was curled up like a cat on the floor. The sunlight streamed in through the forward viewports. The manual wheel gleamed on the bulkhead, unbroken.
Hoskins looked at the sleeping crew and shook his head, half-smiling. Then he stepped to the control console and lifted a microphone from its hook. He began to speak softly into it in his gentle, unimpressive voice. He said:
"Reality is what it is, and not what it seems to be. What it seems to be is an individual matter, and even in the individual it varies constantly. If that's a truism, it's still the truth, as true as the fact that this ship cannot fail. The course of events after our landing would have been profoundly different if we had unanimously accepted the thing we knew to be true. But none of us need feel guilty on that score. We are not conditioned to deny the evidence of our senses.
"What the natives of this planet have done is, at base, simple and straightforward. They had to know if the race who built this ship could do so because they were psychologically sound (and therefore capable of reasoning out the building process, among many, many other things) or whether we were merely mechanically apt. To find this out, they tested us. They tested us the way we test steel—to find out its breaking point. And while they were playing a game for our sanity, I played a game for our lives. I could not share it with any of you because it was a game only I, of us all, have experience in. Paresi was right to a certain degree when he said I had retreated into abstraction—the abstraction of chess. He was wrong, though, when he concluded I had been driven to it. You can be quite sure that I did it by choice. It was simply a matter of translating the contactual evidence into an equivalent idea-system.
"I learned very rapidly that when they play a game, they abide by the rules. I know the rules of chess, but I did not know the rules of their game. They did not give me their rules. They simply permitted me to convey mine to them.
"I learned a little more slowly that, though their power to reach our minds is unheard-of in any of the seven galaxies we know about, it still cannot take and use any but the ideas in the forefront of our consciousness. In other words, chess was a possibility. They could be forced to take a sacrificed piece, as well as being forced to lose one of their own. They extrapolate a sequence beautifully—but they can be out-thought. So much for that: I beat them at chess. And by confining my efforts to the chessboard, where I knew the rules and where they respected them, I was able to keep what we call sanity. Where you were disturbed because the port disappeared, I was not disturbed because the disappearance was not chess.
"You're wondering, of course, how they did what they did to us. I don't know. But I can tell you what they did. They empathize—that is, see through our eyes, feel with our fingertips—so that they perceive what we do. Second, they can control those perceptions; hang on a distortion circuit, as Ives would put it, between the sense organ and the brain. For example, you'll find all our fingerprints all around the port control, where, one after the other, we punched the wall and thought we were punching the button.