Hoberman sphere

[citation needed] A Hoberman sphere typically consists of six great circles corresponding to the edges of an icosidodecahedron.

The motorized sphere weighs 340 kilograms (750 lb), is constructed of aircraft-grade aluminum, and continually oscillates between its compact and expanded states.

The sphere is suspended above the center's Science Court and is actuated with a computer-based motion control system.

This system opens and closes the sphere in a programmed series of lyrical motions choreographed to music, lighting and special effects.

[2] In 1993 a smaller geodesic sphere was installed at the Swiss Science Center Technorama in Winterthur, Switzerland.