 Why does the block tower fall down?
[Transcriber's Note: This etext was produced from Worlds of If Science Fiction, August 1957. "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. Two letters were waiting on Lessing's desk that morning. 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. In recognition of your position as an authority on human Psionic behavior patterns, we would be gratified to schedule you as principle speaker at the Conference in Chicago on October 12th. 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. Natural laws came crashing down about their ears as they stood sadly by and watched things happen which natural law said could never happen. 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.
 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.