Exhibition catalogue published in conjunction with show held at The Museum of Modern Art, New York, February 23 - April 25, 1965. Traveled to the City Art Museum of St. Louis, May 20 - June 20, 1965; the Seattle Art Museum, July 15 - August 23, 1965; The Pasadena Art Museum, September 25 - November 7, 1965; and The Baltimore Museum of Art, December 14, 1965 - January 23, 1966. Text by William C. Seitz on optical art, accompanied by numerous reproductions of works by artists, including: Marc Adrian, Agman [Yaacov Gipstein], Josef Albers, Getulio Alviani, Richard Anuszkiewicz, Edward Avedisian, Walter Darby Bannard, Hannes Beckmann, Larry Bell, Karl Stanley Benjamin, Ernst Benkert, Henryk Berlwei, Alberto Biasi, Max Bill, Paul Brach, Enrico Castellani, Francis Celentano, Toni Costa, Carlos Cruz-Diez, Benjamin Frazier Cunningham, Gene Davis, Tony De Lap, Hugo Rudolfo Demarco, Piero Dorazio, Thomas Downing, Equipo 57, Wojciech Fangor, Paul Feeley, Lorser Feitelson, Jerry Foyster, Günter Fruhtrunk, Sue Fuller, Horacio Garcia Rossi, Gego, Karl Gerstner, John Goodyear, Gerhard von Graevenitz, Lily Greenham, Gruppo N, Frederick Hammersley, Francis Ray Hewitt, Robert Irwin, Ellsworth Kelly, Michael James Kidner, William Komodore, Leroy Lamis, Edoardo Landi, Walter Leblanc, Lynn G. Leland, Julio Le Parc, Mon Levinson, Alexander Liberman, Richard Lippold, Morris Lewis, Wolfgang Ludwin, Sheldon Machlin, Heinz Mack, Enzo Mari, Agnes Martin, Almir Mavignier, John McLaughlin, Edwin Mieczkowski, Guido Molinari, Francois Morellet, Reginald Neal, Kenneth Noland, Eric Olson, Gerald Oster, Henry C. Pearson, Ivan Picelj, Uli Pohl, Larry Poons, Ad Reinhardt, Karl Reinhartz, Bridget Riley, Ludwig Sander, Arnold Schmidt, Peter Sedgely, Eusebio Sempere, Oli Sihvonen, Clara Skinner, Leon Polk Smith, Francisco Sobrino, Julian Stanczak, Jefrey Steele, Joël Stein, Frank Stella, Robert Stevenson, Peter Anthony Stroud, Miroslav Sutej, Tadasky, Luis Tomasello, Claude Tousignant, Wen-Ying Tsai, Günther Uecker, Victor de Vasarely, Ludwig Wilding, Yvaral [Jean Pierre Vasarely] and Walter Zehringer. Includes a complete catalogue of the featured works. Catalogue design by Joseph Bourke Del Valle with covers based on painting by Bridget Riley, "Current," 1964.