Rings of 20 Icosahedra
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Connecting face-to-face, 20 icosahedra can be assembled in a closed ring. Such rings have common members at certain intersections.
Contributed by: Sándor Kabai (April 2007)
Open content licensed under CC BY-NC-SA
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"Rings of 20 Icosahedra"
http://demonstrations.wolfram.com/RingsOf20Icosahedra/
Wolfram Demonstrations Project
Published: April 27 2007