Issue edited by Joseph Masheck. Essays "Participation Performance," by Allan Kaprow; "Einstein on the Beach," by Barbara Baracks; "Diebenkorn Reconsidered," by Budd Hopkins; "Wayne Thiebaud from Phoenix to Des Moines," by Jeff Perrone; "Gustave Caillebotte: The 1970s and the 1870s," by Robert Rosenblum; "Artists' Sketchbooks," by Leo Rubinfien; "Purism: Straightening Up After the Great War," by Kenneth E. Silver. Reviews by Leo Rubinfien, Judith Cardozo, Deborah Perlberg, and Ross Skoggard. Cover: Richard Diebenkorn.