 Why does the block tower fall down?
"He's gone completely hay-wire. Nobody's been able to get near him for three weeks, and now at six o'clock this morning he decides he's leaving the Farm. And it stops things from going in. The first was from Roberts Bros., announcing another shift of deadline on the book, and demanding the galley proofs two weeks earlier than scheduled. As director of psionic research at the Hoffman Medical Center, he had long since learned how administrative detail could suck up daytime hours. When they were finally forced to recognize that this great and powerful force did indeed exist in human minds, with unimaginable potential if it could only be unlocked, they had plunged eagerly into the search, and found themselves in a maddening bramble bush of contradictions and chaos. They were trying to study phenomena which made no sense, observing things that defied logic. And the more they struggled, the thicker and more impenetrable the bramble bush became— But now David Lessing had discovered a pathway through that jungle, a theory to work by— At his elbow the intercom buzzed. "I think you'd better wait before you do that," Melrose said sharply, "because I'm planning to take you apart at the Conference next month unless I like everything I see and hear down here today. "If the papers you've already published are a preview, we think it's false as Satan." "So far, we haven't found any way to set up logical controls," said Melrose.
 Unknown. It is too early in the field of psi research to accurately determine the answer.
 Lessing removed his helmet.  The children used their psi powers to influence Lessing into removing his helmet.  The children removed their helmets.  Unknown. It is too early in the field of psi research to accurately determine the answer.