Tune in, turn on . . . evolve?

In his new book, Supernatural: Meetings with the Ancient Teachers of Mankind, published by Random House, British writer Graham Hancock has taken Prof. Lewis-Williams's research as a point of departure to posit a theory as fascinating as it is provocative: If it's true that cave art derives from altered states of consciousness, then it constitutes a watershed moment in human history, marking the first visible encounter with the supernatural, the first expression of spiritual myth.