No. 4 (Bottoms) expands upon a five-minute film Ono made as a member of the Fluxus group. In the feature-length version, Ono filmed the naked buttocks of some 365 subjects, walking in place, each for approximately fifteen seconds. The derrière-in-motion fills the frame; there is nothing else to look at. What is on the screen becomes resolutely what it is, and something abstract as well. The soundtrack consists of the wry comments of the models, who were recruited from among the London avant-garde community. "Your behind is defenseless" is both Ono's defense and her offense.