John Baldessari (left) at the opening of his exhibition at the Molly Barnes Gallery in Los Angeles, 1968. Photo by Phillip T. Jones and courtesy of John Baldessari. © Phillip T. Jones

John Baldessari at the opening of his exhibition at the Molly Barnes Gallery in Los Angeles, 1968. Photo by Phillip T. Jones and courtesy of John Baldessari. © Phillip T. Jones

Exterior view of the Ferus Gallery during the exhibition of Edward Kienholz's installation Roxy's, 1962. Photo by William Claxton. Courtesy Demont Photo Management, LLC.

William Claxton in 1955. Courtesy Demont Photo Management, LLC.

Stanley Grinstein, Elyse Grinstein, and Sidney B. Felsen in the 1960s. Image courtesy of Stanley and Elyse Grinstein

Ken Price with student work at the University of Southern California, Los Angeles, 1956. Image courtesy of the Ken Price Studio

Ken Price at a party in Los Angeles in 1965. Image courtesy of Ken Price Studio

Ken Price firing works for his Curio Store at the home of Dennis Hopper in Taos, New Mexico, 1973. Photo by Happy Price. Image courtesy of the Ken Price Studio

Lee Mullican in 1959. Image courtesy of Marc Selwyn Fine Art, Los Angeles. © Estate of Lee Mullican

Sam Francis in his studio on West Channel Road in Santa Monica, California, 1968. Photo by Frank J. Thomas. Image courtesy of the Sam Francis Foundation, California

John McCracken in his studio in Costa Mesa, California, in the mid-1960s. Photo by Frank J. Thomas. Courtesy of the Frank J. Thomas Archives

Felix Landau in his gallery on La Cienega Boulevard in Los Angeles. Photo by Frank J. Thomas. Courtesy of the Frank J. Thomas Archives

Robert Irwin, ca. 1967. Photo by Frank J. Thomas. Courtesy of the Frank J. Thomas Archives

Helen Lundeberg in front of one of her paintings. Photo by Frank J. Thomas. Courtesy of the Frank J. Thomas Archives

Larry Bell, Billy Al Bengston, and Ken Price outside Hotel Caesars in Tijuana, Mexico, 1968. Image courtesy of Larry Bell