Entr’Acte Happening at CalArts, 1972, Allan Kaprow. Courtesy Allan Kaprow Estate

Poster for Karl Benjamin exhibition at the Esther-Robles Gallery in Los Angeles, 1964. © Karl Benjamin. The Getty Research Institute, Gift of Michael Asher, 2009.M.30.12

Event performance at University of California, Santa Barbara, 1970, Wolfgang Stoerchle. Gelatin silver print documenting the event, unknown photographer. 9 15/16 x 8 in. The Getty Research Institute, 2009.M.16.1. © J. Paul Getty Trust

Every Building on the Sunset Strip, 1966, Ed Ruscha. Self-published book, offset lithograph, 1966 (second printing 1971). 7 1/8 x 5 3/4 x 3/8 in. Open unfolded: 7 1/8 x 297 in. The Getty Research Institute, 86-B19486.c1. © Ed Ruscha

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 Alexander, John Reed, Wallace Berman, Juanita Dixon, and Walter Hopps in the alley next to Ferus Gallery in Los Angeles, ca. 1957. The Getty Research Institute, Charles Brittin papers, 2005.M.11.9. © J. Paul Getty Trust. Photo by Charles Brittin

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

Film Can Library, Universal Studios, 1978, Anthony Friedkin. Gelatin silver print. 12 x 17 11/16 in. Gift of Sue and Albert Dorskind. © Anthony Friedkin

Finished Housing, Lakewood, California, 1950, William A. Garnett. Gelatin silver print. 7 3/8 x 9 7/16 in. © Estate of William A. Garnett

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

Foundation and Slabs, Lakewood, California, 1950, William A. Garnett. Gelatin silver print. 7 7/16 x 9 3/8 in. © Estate of William A. Garnett

Framing, Lakewood, California, 1950, William A. Garnett. Gelatin silver print. 7 1/4 x 9 1/2 in. © Estate of William A. Garnett

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

Full Jar, Empty Jar performance at Art Gallery, University of California, San Diego, 1974, Barbara T. Smith. © Barbara T. Smith