Magnetic icosahedron. 
Ed builds strange shapes out of magnets some times.  Of course it's mathematically interesting to see what shapes can be built this way, and a hollow icosahedron is pretty impressive!  This one is made out of high-strength neodymium-iron-boron magnets. 
Source: Force Field 
Contributor: Ed Pegg Jr 
Acquired: 8 April, 2004 
Price: Donated 
Size: 2.5" 
Purity: <35%
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