Richard Diebenkorn, Seawall, 1957. Oil on canvas. 20 x 26 inches. Fine Arts Museums of San Francisco, gift of Phyllis G. Diebenkorn, 1995.96. © 2013 The Richard Diebenkorn Foundation. Zoom in and view Seawall in amazing gigapixel detail in the de Young's Google Art Project collection.

Rose Mandel, Richard Diebenkorn, 1956. Digital scan from original negative. © Rose Mandel Archive/All Rights Reserved

Richard Diebenkorn (1922-1993), Figure on a Porch, 1959. Oil on canvas, 57 x 62 inches. Oakland Museum of California, Gift of Anonymous Donor Program of the American Federation of the Arts. © 2013 The Richard Diebenkorn Foundation

Richard Diebenkorn (1922-1993), Untitled, 1955. Oil on muslin, 12 3/4 x 15 7/8 inches. The Wayne Thiebaud Foundation © 2013 The Richard Diebenkorn Foundation