Published in conjunction with a 1973 University of California, Irvine exhibition, this flip-book style artist's book contains fifteen images of photographs, by Dan Graham, of John Baldessari, in full body profile, in the process of throwing a ball. This action is set off by horizontal lines, marking, like sheet music, the movement, and thus creating three melodies and fifteen chords.

John Baldessari (1931–2020) was a seminal American conceptual artist. His work often features found photography and appropriated images and centers on a combination of the narrative potential of images and the associative power of language, all often with an element of humor.