View of Market Street in Venice, California, in 1970, showing the studio buildings of Larry Bell (right) and Robert Irwin (left). Photo by Larry Bell. Courtesy of and © Larry Bell

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

Robert Graham working on one of his boxes in the 1960s. Image courtesy of the Robert Graham Estate

Robert Graham working on one of his boxes in the 1960s. Image courtesy of the Robert Graham Estate

Robert Graham in the 1960s. Image courtesy of the Robert Graham Estate

Hard Edge group exhibition with works by Ronald Davis and Judy Chicago at Rolf Nelson Gallery in Los Angeles, May 1964. The Getty Research Institute, Gift of Rolf G. Nelson, 2010.M.38.2

Larry Bell in his studio in Venice, California, ca. late 1960s. Image courtesy of and © Larry Bell

Announcement for Judy Chicago exhibition at California State University, Fullerton, October 23– November 25, 1970. The Getty Research Institute, Gift of Rolf G. Nelson, 2010.M.38.5. Image courtesy of Jerry McMillan and Craig Krull Gallery, Santa Monica. © Jerry McMillan.

Andrew Perchuk, Getty Research Institute, with John Mason inspecting Mason’s sculpture Orange Cross, 2010. © J. Paul Getty Trust

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

Wallace Berman and friends in the alley next to the Ferus Gallery showing a sculpture to the LAPD vice squad, 1957. The Getty Research Institute, Charles Brittin papers, 2005.M.11.10. © J. Paul Getty Trust. Photo by Charles Brittin

Announcement for the inaugural exhibition Recent Work by Masami Teraoka at Space Gallery in Los Angeles, 1975–76. © Masami Teraoka. The Getty Research Institute, Gift of George Herms, 2009.M.20.5

Judy Gerowitz, also known as Judy Chicago, with her Sunset Squares installation at Rolf Nelson Gallery in Los Angeles, 1966. © 2011 Judy Chicago / Artists Rights Society (ARS), New York. The Getty Research Institute, Gift of Rolf G. Nelson, 2010.M.38. Image courtesy of Jerry McMillan and Craig Krull Gallery, Santa Monica. © Jerry McMillan

Poster for Craig Kauffman exhibition at Ferus Gallery in Los Angeles, 1962. © The Estate of Craig Kauffman. The Getty Research Institute, Gift of Michael Asher, 2009.M.30.16. Courtesy Frank Lloyd Gallery, Santa Monica, California

Inside and Out, 1964, Melvin Edwards. Welded steel. 12 x 8 3/4 x 5 3/4 in. Collection of Susan and David Lawrence. © Melvin Edwards