See also: https://photos.app.goo.gl/sWZWDNHCbh52NWvc2 Album in Google Photos
Source: This Week’s Finds in Mathematical Physics (Week 265) John Baez http://math.ucr.edu/home/baez/week265.html 14) James Dolan, Pythagorean pentagram,
The Great Stellated Dodecahedron textured with the Pythagorean Pentagram:
Pythagorean_Pentagram.nb (204 KB)