A Spikey Made of Tetrahedra and Octahedra
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This spikey is assembled from tetrahedra and octahedra that can be moved apart.
Contributed by: Sándor Kabai (October 2008)
Open content licensed under CC BY-NC-SA
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"A Spikey Made of Tetrahedra and Octahedra"
http://demonstrations.wolfram.com/ASpikeyMadeOfTetrahedraAndOctahedra/
Wolfram Demonstrations Project
Published: October 7 2008