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Hoberman SphereA Hoberman sphere is a structure that resembles a geodesic dome, but is capable of folding down to a fraction of its normal size by the scissor-like action of its joints. They have become popular as a child's toy. Several sizes exist, with the original design capable of expanding from 15 cm (6 inches) in diameter to 76 cm (30 inches). A Hoberman sphere is not a true sphere, but a kind of spherical polyhedron known as an icosadodecahedron. The largest existing Hoberman Sphere is in the atrium of Liberty Science Center in Jersey City, New Jersey. Fully expanded, it is 5.5 m (18 feet) in diameter. It's motorized, weighs 318 kg (700 pounds), is made of stainless steel and aluminum, and is in continuous, automatic motion. Its inventor, Chuck Hoberman, holds several patents on folding techniques.
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