An examination of an experiential and experimental art form that, despite its evanescence, has shaped participatory art into the present. "Happenings" have pop connotations that conjure up 1960s youth culture and hippies in public, joyful rebellion. Scholars, meanwhile, locate happenings in a genealogy of avant-garde performance that descends from futurism, surrealism, and Dada through the action painting of the 1950s. In Radical Prototypes,...