But there was a way!

The crystal extended through both worlds. All Dave had to do was to get the crystal and use it as a stylus against some surface in the other world.

He turned to follow the pneumatic tube towards the place where the crystal had gone. He was not more than a hundred yards down the length of the tube when the sky blinded him from a couple of miles away, and then the air roared, and then when vision returned he could see a pillar of white smoke billowing skyward. They had destroyed the crystal!

Dave stopped to think.

Clearly, the exploding crystal was as dangerous on this side as it was on the other. That meant that no one could stand close by and watch the thing to be sure of which physicists they got—unless they used some sort of television hookup.

So Dave retraced his steps to the laboratory and inspected it. He saw nothing, and so began to feel his way through the walls of the building. He became engrossed in this job; it was both interesting and a bit terrifying to go walking through walls and feeling along the insides of beams and rafters. The building was a sort of thick phantom. Not only were the walls transparent, but the pipe lines, electrical wiring, nails, and other normally hidden bits of construction were visible within them. And walking along the length of a wall with a shoulder on either side, one in one room and one in the other, was disconcerting as well as amusing.

The heavy concrete-block walls, set up for radiation barriers, were wider than Crandall's shoulder-spread, and he could walk through their length completely enclosed in the hard concrete. Here it was eerie, too, for encased in the concrete were electrical wires and pipes, to Dave no heavier than the concrete through which he walked, but none the less clearly visible.

So Dave inspected the remote lab, walking down the walls and through the pipes and wires that stretched through the house like a spider's web, and he saw no evidence of espionage—

—until he caught his throat under a wire that should have been as tenuous as the others, but which almost throttled him.

Dave bounded back, clutching at his throat and swearing soundly.

Then he realized!

And forgetting his throat, Dave followed the wire to one of the remote video and audio sets. He pulled it aside—and it split 

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