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The first face-turning icosahedron with planar cuts.
The third entry in the series of puzzles called radiolarian. Since the Cornered radiolarian has just additional corner pieces it is ignored in this series. There this puzzle bears the alternative name Radiolarian II.
The prefix circo is a nod to Circogonia Icosahedra, the organism that inspired the Radiolarian name.
Edge length: 65 mm (identical to Radiolarian I)
Weight: 301 grams
An identical looking (although black) puzzle was designed and built by Bob Hearn but published 3 days later. Please refer to image #3. This variant has an edge length of 53.3 mm.
In 2011, MF8 announced that it would be mass producing a "rex dodecahedron", which is actually the dodecahedral equivalent of this puzzle.
In 2015 the icosahedral variant was published as mass produced variant.
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Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann.
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