Nick Herbert's Elemental Mind makes an interesting supposition -- that the mind, or consciousness, is a force that interacts with the world, like gravity or electromagnetism. He makes a pretty good argument that ESP and Telekinesis would prove that this is so; unfortunately, his examples (the typewriter open to the quantum void and the branching photon experiment) don't seem to show any evidence that the greater supposition is correct. The book is very interesting, though, and leads one into all manner of speculation about how peculiar the quantum universe and though actually are. A well written, entertaining, and informative book.