Oase No. 7 was designed as part of the Documenta 5 exhibition in Kassel, 1972. The Cloud by Coop Himmelb(l)au was also designed to be featured in Documenta 5, however it remained unbuilt.
Oase No. 7 is a transparent sphere with a diameter of 8 metres, the sphere was placed in front of the main facade on the Friedericianum. A catwalk made of standard tubular steel sections projected through the window from the interior of the building into the transparent sphere. A tubular steel ring was fixed to this footbridge, at a slight distance from the facade. This ring formed the external support for a PVC foil shell that formed a sphere when inflated into shape by an air pump.