"FILM SET A: SPINNING SPHERE

A steel ball placed on a glass plate in a white cube of space. The ball is set spinning and filmed so that the image reflected on the surface of the ball has one wall of the cube centered. The ball is center frame and fills most of the frame. The camera is hidden as much as possible so that its reflection will be negligible. Four prints are necessary. The prints are projected onto the walls of the room (front or rear projection; should cover the walls edge to edge). The image reflected in the spinning sphere should not be that of the real room but of a more idealized room, of course empty, and not reflecting the image projected on the other room walls. There will be no scale referents in the films. "

Bruce Nauman, "Notes and Projects", Artforum 9, no.4 (December 1970), p. 44.