I ran into this on Facebook, where I posted it in 2011. That was the year before I started this blog.
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An Intermediate Form Between the Icosidodecahedron and the Rhombic Triacontahedron
This polyhedron combines the faces of an icosidodecahedron (red and blue) with the those of a rhombic triacontahedron (green). The gaps between those two sets of polygons are the yellow rectangles. I made this using the “morph duals by expansion” function of Stella 4d: Polyhedron Navigator. You can try this program for yourself, free of charge, at http://www.software3d.com/Stella.php.
Blues and Violets
At 53, My Age Is a Prime Number Again
A Tessellation for the New Year MMXXI
A Tessellation of Regular Hexagons and Squares, as Well as Equilateral and Elongated Hexagons
A Tessellation Featuring Regular Enneagons and Triangles, as Well as Equilateral Three-Pointed Stars
A Tessellation Featuring Regular Octagons and Triangles, Together with Equilateral Four- and Six-Pointed Stars
A Tessellation Featuring Regular Heptagons and Triangles, Together with Equilateral Four- and Six-Pointed Stars
A Dodecahedron, with Mandalas
The mandala used here first appeared in this blog-post. I then used Stella 4d: Polyhedron Navigator to put those images on the faces of a dodecahedron. If you’d like to try this program yourself, you can do so, for free, at http://www.software3d.com/Stella.php.