Allan McCollum assembles a group of his Constructed Paintings in his studio at Brooks Avenue and Speedway in Venice, California, 1972. Image courtesy of and © Allan McCollum

John Baldessari in 1960. Image courtesy of John Baldessari

John Baldessari in the late 1960s. Image courtesy of John Baldessari

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

Allan McCollum with one of his Constructed Paintings in his studio on Brooks Avenue in Venice, California, ca. 1971. Photo by Frank J. Thomas. Courtesy of the Frank J. Thomas Archives

Bruce Nauman in his studio in Pasadena, California, ca. 1970. Photo by Frank J. Thomas. Courtesy of the Frank J. Thomas Archives

Robert Irwin and James Turrell inside the anechoic chamber at UCLA, 1969. Image courtesy of Malcolm Lubliner and Craig Krull Gallery, Santa Monica. © Malcolm Lubliner

ASCO and Los Four opening reception at the Point Gallery in Los Angeles, 1975. ©1975, Harry Gamboa, Jr.

Announcement for Jack Goldstein exhibition at the Mizuno Gallery in Los Angeles, November 1972. © Jack Goldstein Estate. The Getty Research Institute, Gift of Riko Mizuno, 2010.M.84.1

Announcement for Dead Man performance by Chris Burden at the Mizuno Gallery in Los Angeles, November 12, 1972. © Chris Burden. The Getty Research Institute, Gift of Riko Mizuno, 2010.M.84.4

Letter and brochure for Al's Grand Hotel, May 2, 1971, designed by Allen Ruppersberg. Offset lithograph brochure, typed letter (signed). © Allen Ruppersberg. The Getty Research Institute, Gift of Michael Asher, 2009.M.30.2

Heavy Industry Publications advertising books by Ed Ruscha, ca. 1968. Offset lithograph. © Ed Ruscha. The Getty Research Institute, Gift of Michael Asher, 2009.M.30.1

Ed Ruscha's studio at 1024 3/4 N. Western Avenue in Hollywood, California, 1970. Photo by Larry Bell. Image courtesy of Billy Al Bengston

Robert Graham looking at his wax sculptures in his exhibition at Nicholas Wilder Gallery, 1968. © Robert Graham. Image courtesy of Jerry McMillan and Craig Krull Gallery, Santa Monica. © Jerry McMillan