Cloud Nine is the name Buckminster Fuller gave to his proposed airborne habitats created from giant geodesic spheres, which might be made to levitate by slightly heating the air inside above the ambient temperature. Geodesic spheres become stronger (and relative to the volume enclosed, lighter) as they become bigger, because of how they distribute stress over their surfaces.
Cloud Nine is the name Buckminster Fuller gave to his proposed airborne habitats created from giant geodesic spheres, which might be made to levitate by slightly heating the air inside above the ambient temperature. Geodesic spheres become stronger (and relative to the volume enclosed, lighter) as they become bigger, because of how they distribute stress over their surfaces.
Source: Wikipedia "Cloud Nine (sphere)" · CC BY-SA 4.0
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