Exhibition catalogue published in conjunction with a conference held at the Walker Art Center, June 8 - 11, 1983. Texts by Melinda Ward, Bill Horrigan, J. Ronald Green, Brian O'Doherty, Virgil Grillo, Gene Youngblood, Howard Wise, Jonas Mekas, Stan Brakhage, Nam June Paik, Shirley Clarke, Ed Emshwiller, Tony Conrad, Alvy Ray Smith, Frank Hodsoll, B. Ruby Rich, Renee Tajima, Barbara London, John Giancola, Jon Alpert, George C. Stoney, Bill Viola, and Robert A. Haller. Includes contributor's biographies.