The wall began to open.

"Here's the plan, quick," said Watkins. "I've got to get out and find the machine, and see if I can gimmick it so it'll work backward, send us home. The rest of you create a diversion, keep the kids' minds off me."

"What kind of a diversion?" asked Villa. His abstracted face showed plainly that he was thinking of his chili stand and what he would say to the idiot relief man about conditions he would doubtless find therein.

"If you were a kid with pets, intelligent ones, what would you watch them do for hours? Something unordinary—something you'd never imagine they'd do." He looked at his chronograph. "It's just ten. I never saw the gadget I couldn't figure out in two hours; if I'm not back by noon, you'd better come out, Summersby."

"What if it's four-dimensional?" asked Adam.

"It's possible I can cook up a way to reverse its action anyway. There are some principles of electricity and mechanics that must be universal."

"Shall we run the machines for them?" asked Mrs. Full. "To distract the children?"

"They're used to that," said Watkins. "They bore easy. Suppose you're a kid with a normal regard for pets. You've had cats and dogs and rabbits and now you have monkeys. The monkeys are a lot smarter and more versatile, but they have their limits too. You get jaded with 'em. But one day they—" he snapped his fingers—"they start playing soldiers! They drill, stage mock battles, die and come to life, scrimmage—hell, you go nuts! You can't take your eyes off 'em!"

"That's it," said Villa promptly. "The children have gorillas, cows, they have never seen anything like war."