Exhibition catalogue published in conjunction with show held at Museo Nacional Centro de Arte Reina Sofía, Madrid, June 19 – October 4, 2010. Essays by Julia Robinson, Hannah Feldman, Agnes Berecz, Emmelyn Butterfield-Rosen, and Benjamin H. D. Buchloh with an additional text on the exhibition by Sidney Janis. Artists include Arman, George Brecht, Cesar, Christo, Gérard Deschamps, Jim Dine, François Dufrêne, Oyvind Fahlstrom, Raymond Hains, Allan Kaprow, Yves Klein, Yayoi Kusama, Roy Lichtenstein, Piero Manzoni, Claes Oldenburg, Giuseppe Pinot Gallizio, Robert Rauschenberg, Martial Raysse, Mimmo Rotella, Niki de Saint Phalle, Daniel Spoerri, Jean Tinguely, Robert Watts, and Robert Whitman. Includes a checklist of the exhibition, an appendix, and author biographies.