Pollock, Bench, Child, 1959, Hans Haacke
Hans Haacke was an art student in Kassel when Documenta 2 opened in 1959, and he decided to "document Documenta" with his camera. His series of photos were included by Open Eye in the 2014 Liverpool Biennial, which closes tomorrow.
Not All Documents Are Records: Photographing Exhibitions as an Art Form [openeye.org.uk]