Poster for The Studs group exhibition at the Ferus Gallery in Los Angeles, 1964. Image courtesy of Hal Glicksman

Flanders, 1961–62, Llyn Foulkes. Mixed media. 54 x 36 x 14 in. and 16 x 15 3/4 in. Collection of Ernest & Eunice White. © Llyn Foulkes. Photo © Douglas M. Parker Studio

For People Who Know The Difference, 1967, John McCracken. Polyester resin, fiberglass, and plywood. 120 x 20 1/4 x 3 1/4 in. Collection of the Mohn Family Trust. © The Estate of John McCracken. Courtesy David Zwirner, New York

Freeway, 1966, Vija Celmins. Oil on canvas. 17 1/2 x 26 3/8 in. Collection of Harold Cook, Ph.D. © Vija Celmins. Image courtesy McKee Gallery, New York

Gonna California, 1969, recorded by Terry Allen. Vinyl record (45rpm). 6 7/8 in. diameter. The Getty Research Institute, Allan Kaprow Papers, 980063.180. © Terry Allen, Green Shoes Publishing, BMI, Administered by BUG Music

Green and Cream, 1966, Ken Price. Glazed ceramic. 4 x 8 1/2 x 3 1/2 in. Private collection. Permission courtesy Ken Price Studio. Photo by Zoe Zimmerman

Poster for the exhibition War Babies at Huysman Gallery in Los Angeles, May 29–June 17, 1961. Poster created by Jerry McMillan and Joe Goode. Photo © Jerry McMillan. Design © Joe Goode. The Getty Research Institute, 2006.M.1.5. Image courtesy of Jerry McMillan and Craig Krull Gallery, Santa Monica

Larry Bell in his Market Street studio in Venice, California, 1961. Image courtesy of Larry Bell, Marvin Silver and Craig Krull Gallery, Santa Monica. © Marvin Silver

Poster for the “Angry Arts” Against the War Peace Walk, 1967. Designed by Hardy Hanson. Courtesy of the artist. The Getty Research Institute, Charles Brittin papers, 2005.M.11.31

Larry Bell in his studio in Venice, California, 1969. Image courtesy of Malcolm Lubliner and Craig Krull Gallery, Santa Monica. © Malcolm Lubliner

Poster for John Baldessari exhibition Pure Beauty at Molly Barnes Gallery in Los Angeles, 1968. © John Baldessari. The Getty Research Institute, 890164.87

Ed Ruscha and Joe Goode on horseback. Exhibition catalogue cover for the Fine Arts Patrons of Newport Harbor at the Balboa Pavillion Gallery, 1968. Image courtesy of Jerry McMillan and Craig Krull Gallery, Santa Monica. © Jerry McMillan

Sam Francis working in his studio in Santa Monica, California, 1971. Image courtesy of Malcolm Lubliner and Craig Krull Gallery, Santa Monica. © Malcolm Lubliner

Betye Saar viewing her etchings at a group exhibition in at the Palos Verdes Library Gallery in Palos Verdes, California, June 4, 1961. Photo by Richard Saar. Image courtesy of Betye Saar

Poster for the exhibition War Babies at Huysman Gallery in Los Angeles, May 29–June 17, 1961. Poster created by Jerry McMillan and Joe Goode. Photo © Jerry McMillan. Design © Joe Goode. The Getty Research Institute, 2006.M.1.5. Image courtesy of Jerry McMillan and Craig Krull Gallery, Santa Monica