31.5 x 31cm, 342pp. Publisher's brown burlap lettered in pale orange. First Edition of this major authoritative publication on the performance arts of the 60s. Illustrated throughout with fantastic images of happenings, and installations - many of and by Allan Kaprow. as well as Jackson Pollock, Robert Rauschenberg, Claes Oldenburg, Red Grooms, Gutai, Jean-Jacques Lebel, Wolf Vostell, George Brecht, Kenneth Dewey, and Milan Knizak amongst others. There is damage to the top and bottom of the burlap boards along the front spine (slight unravelling) else it is in VG condition. An important reference as well as artist's book.