wheel occurs in the movie camera and in the movie projector. It is significant that this most subtle and complex grouping of wheels should have been invented in order to win a bet that all four feet of a running horse were sometimes off the ground simultaneously. This bet was made between the pioneer photographer Edward Muybridge and horse-owner Leland Stanford, in 1889. At first, a series of cameras were set up side by side, each to snap an arrested moment of the horse’s hooves in action. The movie camera and the projector were evolved from the idea of reconstructing mechanically the movement of feet. The wheel, that began as extended feet, took a great evolutionary step into the movie theatre. By an enormous speed-up of assembly-line segments, the movie camera rolls up the real world on a spool, to be unrolled and translated later onto the screen. That the movie re-creates