Beschreibung
A d4 that rolls! Available from https://mathartfun.com/DiceLabDice.html
Patrick Robert's website: http://www.xtalgrafix.com/Spheroform.htm
Shaun Bentley's blog post: https://www.goengineer.com/blog/math-and-art-smooth-rollers-solidworks
Grand Illusion's video: https://www.youtube.com/watch?v=lZPFMaVGeW8