San Pedro is a seaside city. Part of the Los Angeles Harbor, it sits on the edge of a channel. Attempt to correlate social class with elevation above main harbor channel (San Pedro, July 1975) is a series of coupled gelatin silver prints which show the artist using his hand to mete out the elevation of various real estate plots there, ranging from a manicured mansion to a ramshackle beach house. A direct equation becomes evident between the social strata these homes represent, and the height at which the artist holds his hand. By assigning a simple, visual value to an otherwise murky undercurrent, Sekula surfaces issues of class and subjects them to unconventional inquiry.