The close similarity between these two spherical cups is based on a set of moving compressive bars that are connected together to form a three dimensional mechanism. These two deployable structures are capable of expanding up to several times of their packaged size, when their bars are rotated relative to one another. In the first spherical cup, all the bars meet with one another once the structure contracts from a dome-like shape to a completely compact bundle. This leads to the structure that corresponds
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