also featured some years ago in a Matt Parker video who presented it on a math fest https://www.youtube.com/watch?v=R9c-_neaxeU https://www.youtube.com/watch?v=

also featured some years ago in a Matt Parker video who presented it on a math fest https://www.youtube.com/watch?v=R9c-_neaxeU https://www.youtube.com/watch?v=R9c-_neaxeU