Related: Interesting Hypocycloid image (from xahlee site, which follows): https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcTXszjXrEnqc9HasYGFPCHWES8sBA

Related: Interesting Hypocycloid image (from xahlee site, which follows): https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcTXszjXrEnqc9HasYGFPCHWES8sBAZ4mJ6xww&usqp=CAU https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcTXsz... Epicycloid and Hypocycloid: http://xahlee.info/SpecialPlaneCurves_dir/EpiHypocycloid_dir/epiHypocycloid.html http://xahlee.info/SpecialPlaneCurves_dir/EpiHypocycloid_dir... Evolute: http://xahlee.info/SpecialPlaneCurves_dir/Evolute_dir/evolute.html http://xahlee.info/SpecialPlaneCurves_dir/Evolute_dir/evolut... (Star Trek IV, Computer administering test, to Mr. Spock: "Adjust the sine wave of this magnetic envelope so that anti-neutrons can pass through it but anti-gravitons cannot.") Google Image Search, "Hypocycloid": https://www.google.com/search?q=hypocycloids&tbm=isch https://www.google.com/search?q=hypocycloids&tbm=isch