Anthony McCall. Notebook: May 1, 1975 - June 26, 1975. Study for "Long Film for Ambient Light".

Anthony McCall. Notebook: May 1, 1975 - June 26, 1975. Study for "Long Film for Ambient Light".

Anthony McCall. "Long Film for Ambient Light" (1975). Announcement, The Idea Warehouse, New York (1975).

Anthony McCall. "Long Film for Ambient Light" (1975). Installation view at Idea Warehouse, New York, 2pm, June 18, 1975. Photograph by Anthony McCall.

Anthony McCall. "Long Film for Ambient Light" (1975). Installation view at Idea Warehouse, New York, 3am, June 19, 1975. Photograph by Anthony McCall.

Anthony McCall. "Long Film for Ambient Light" (1975). Time schema installation view at Idea Warehouse, New York, 1975. Photograph by Anthony McCall.

Anthony McCall. "Long Film for Ambient Light" (1975). Time schema installation view at Idea Warehouse, New York, 1975. Photograph by Anthony McCall.

Anthony McCall. "Long Film for Ambient Light" (1975). Wall statement installation view at Idea Warehouse, New York, 1975. Photograph by Anthony McCall.

Anthony McCall. "Long Film for Ambient Light" (1975). Installation view at Neue Galerie, Aachen, 1976. Photograph by Anthony McCall.

Anthony McCall. "Long Film for Ambient Light" (1975). Installation view at Musée de Rochechouart, 2007. Photograph by Freddy Le Saux.

Anthony McCall. "Long Film for Ambient Light" (1975). Installation view at Musée de Rochechouart, 2007. Photograph by Freddy Le Saux.

Anthony McCall. "Long Film for Ambient Light" (1975). Time schema installation view at Musée de Rochechouart, 2007. Photograph by Freddy Le Saux.