Cyanotypes, by Christian Marclay (Flash):
The photograms in this exhibition are made with music cassette tapes he has physically disassembeled. In some, the plastic cases form austere grids.
The cyanotype process dates to the dawn of photography and was developed by the English scientist Sir John Herschel in 1842. Using a light-sensitive chemical mixture, these cyanotypes were created by placing objects directly onto the surface of paper coatd with the mixture. The resulting blue photograms reveal a silhouetted image that varies in darkness due to the opacity of the objects.