Ring of 90 Rhombohedra
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Ten golden rhombohedra are arranged in a ring and ten such rings are assembled in a larger ring. In this assembly ten rhombohedra overlap, which is why 90 rhombohedra are enough to make a physical model.
Contributed by: Sándor Kabai (June 2008)
Open content licensed under CC BY-NC-SA
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"Ring of 90 Rhombohedra"
http://demonstrations.wolfram.com/RingOf90Rhombohedra/
Wolfram Demonstrations Project
Published: June 13 2008