WITHOUT THINKING, HE moved a switch. Why? Because it was right to move that switch. When a certain light flared green, a certain switch had to be thrown. Why? Well, when a certain light flared green, a certain switch—
He abandoned that problem. Never mind why; what the devil was going on?
Glenn Tropile squinted about him like a mollusc peering out of its shell. There was another fact, the oddness of the seeing. What makes it look so queer, he asked himself.
He found an answer, but it required some time to take it in. He was seeing in a strange perspective. One looks out of two eyes. Close one eye and the world is flat. Open it again and there is a stereoscopic double; the saliencies of the picture leap forward, the background retreats.
So with the lights on the board—no, not exactly; b
