Hoberman Sphere (Octahedron)

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Expandable flat rings made of scissors are placed on a sphere's great circles that lie along the edges of an invisible octahedron. The number of scissors in a ring must be divisible by four. The geometry of this assembly corresponds to that of a Hoberman sphere.
Contributed by: Sándor Kabai (April 2007)
Open content licensed under CC BY-NC-SA
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"Hoberman Sphere (Octahedron)"
http://demonstrations.wolfram.com/HobermanSphereOctahedron/
Wolfram Demonstrations Project
Published: April 27 2007