Oase No. 7 (Oasis No. 7), Haus-Rucker-Co (Laurids Ortner, Manfred Ortner, Klaus Pinter, and Günter Zamp Kelp), 1972. Part of documenta 5: Questioning Reality–Image Worlds Today at Museum Fridericianum, 1972. The Getty Research Institute, 2011.M.30. Photo: Balthasar Burkhard