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Tensegrity
Tensegrity, tensional integrity or floating compression is a structural principle based on a system of isolated components under compression inside a network of continuous tension, and arranged in such a way that the compressed members do not touch each other while the prestressed tensioned members delineate the system spatially. Wikipedia
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Fuller experimented with collapsible tensergity domes in the 1950s. The design problem becomes to collapse a prolated sphere along it's longest axis.
en.wikipedia.org/wiki/Kinematics_of_the_cuboctahedron
https://en.wikipedia.org/wiki/Kinema..._cuboctahedron
Those four vertexes in the middle move in an X shape.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Impossible is just something we haven't done yet. -- Langley Outdoors Academy
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