This unusual book is based on the premise of quantum mechanics known as Brownian motion, i.e. that every molecule affects every other molecule on a quantum level, so what looks like random actions aren't really quantumly. The same trick was done by Robert Anton Wilson in one of the Schrodinger's Cat books, but Wilson doesn't have Dick's innate sense of character. Dick's characters are frustratingly human, even more here in this "mainstream" book than in his science fiction. If you wonder what Dick's lost novel The Owl and the Pussycat would have been like, I suspect a lot like this one.