Bright light—daylight—filled the room with so sudden a gush that Barney\'s breath caught in his throat. The book seemed to leap out of his hands. With the same glance he saw then the low, wide picture window which abruptly had appeared in the opposite wall, occupying almost half its space—and, in the other wall on the far left, a big door which was still swinging slowly open into the room. Daylight poured in through window and door. And beyond them—

For seconds he stared at the scene outside, barely aware of what he was looking at, while his mind raced on. He had searched every inch of the walls. And those thick wooden panels hadn\'t simply slid aside; the surfaces of doorframe and window were flush with the adjoining wall sections. So the McAllen Tube was involved in these changes in the room—and he might have guessed, Barney thought, that McAllen would have found more than one manner of putting the space-twisting properties of his device to use. And then finally he realized what he was seeing through the window and beyond the door. He walked slowly up to the window, still breathing unevenly.

The scene was unfamiliar but not at all extraordinary. The cabin appeared to be part way up one side of a heavily forested, rather narrow valley. It couldn\'t be more than half a mile to the valley\'s far slope which rose very steeply, almost like a great cresting green wave, filling the entire window. Coming closer Barney saw the skyline above it, hazy, summery, brilliantly luminous. This cabin of McAllen\'s might be in one of the wilder sections of the Canadian Rockies.

Or—and this was a considerably less happy thought—it probably could have been set up just as well in some area like the Himalayas.

But a more immediate question was whether the cabin actually was in the valley or only appearing to be there. The use of the Tube made it possible that this room and its seeming surroundings were very far apart in fact. And just what would happen to him then if he decided to step outside?

There were scattered sounds beyond the open door: bird chirpings and whistles, and the continuous burring calls of what Barney decided would be a wild pigeon. Then a swirl of wind stirred the nearer branches. He could feel the wash of the breeze in the room.

It looked and sounded—and felt—all right.

Barney scowled undecidedly, clearing his throat, then discovered that a third item had appeared in the room along with the door and the window. In the wall just this side of the door at shoulder-height was a small ivory plate with two black switches on it. Presumably the controls for door and window....

Barney went over, gingerly touched the one on the right, watching the window; then flicked up the switch. Instantly, the window had vanished, the wood paneling again covered the wall. Barney turned the switch down. The window was back.

The door refused to disappear until he pushed it shut. Then it obeyed its switch with the same............