Neville's one sustained use of modern physics, told as a chain of names and dates. Einstein in 1905 gives the equation; in 1928 Dirac, working from relativity, postulates a particle nobody has seen and names it the positron - if the equation is true, this must exist; four years later Anderson proves it experimentally in cosmic-ray photographs, to the embarrassment of the theoretical physicists, who cannot discount it and do not know what to do with it, because everything about it is backward. In 1949 Feynman writes it up: it is a wrong-way electron, upside down, its charge positive instead of negative, and when a speeding electron hits something it is usually deflected and continues on its way, but if it is hit too hard its time sense is reversed and it moves backwards in time. Neville is careful about the distinction - being deflected round a room and ending where you started is a journey in space, and the clock still runs forward. The bridge to his own subject is a premise rather than an analogy: God is one and his name is one, therefore the physics of the mind cannot differ in any respect from the physics of the rest of nature, so what the particle does in the cloud chamber it must also do in the mind of man. And that, he says, is what the mystical experiences are. We are all moving forward negatively, like electrons, toward an invisible goal, until God strikes a blow from above so hard that the time sense reverses and the man jumps back - two thousand years in the twinkle of an eye to the birth, five months later another thousand to David, four months after that another thousand to the brazen serpent - and enacts the drama as its star instead of having merely heard of it. He then applies Feynman's own description of the particle's path to the technique in the same breath: it starts from where it hasn't been and speeds to where it was an instant ago, which is exactly what happens when you put yourself elsewhere in imagination and then open your eyes.