Haus-Rucker-Co were a Viennese group founded in 1967 by Laurids Ortner, Günther Zamp Kelp and Klaus Pinter, later joined by Manfred Ortner. Based in Vienna, the group was known for their interactive exhibitions and their development of utopian architectural ideas, which showed how people could affect their own environment. Installations made from pneumatic structures such as Oase No. 7 (1972), which was created for Documenta 5 in Kassel, Germany. An inflatable structure emerged from the façade of an existing building creating a space for relaxation and play. The different versions of the Mind Expander series (1967-69), consisted of various helmets that could alter the perceptions of those wearing them, for example the ‘Fly Head’ disoriented the sight and hearing of the wearer to create an entirely new apprehension of reality.