About Juno's Spinner 2

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Motion of four-bar linkage mechanism
Cube type Juno's Spinner is composed of two kinds of element.

Square elements must be outer,shape of inner element must be like right figure to avoid a collision.
6 outer elements


8 inner elements
Four-bar linkage mechanism shrinks like this.

About tranformable polyhedron, Hugo F. Verheyen studied many years ago:
"AN ALTERNATIVE GENERATION AND TRANSFORMATION THEORY FOR UNIFORM POLYHEDRA(3d edition 1981)".
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