Diane Arbus was a photographer, born Diane Nemerov in New York City on March 14 1923, who committed suicide in 1971.

She favoured the TLR medium format cameras that gave square pictures. After working as a fashion photographer she devoted her last years to photographing freaks, outcasts and "ordinary citizens" in poses and settings that conveyed a disturbing sense that something was seriously wrong.

Her voyeuristic approach did not, however, demean her subjects as it might easily have done. In most of her portraits the subjects are on their own turf, seemingly comfortable; instead, it is the viewer who is made uncomfortable.