Today while the youngest swims, I'm playing with this: http://507movements.com/mm_152.html
It took a while to convince myself it was really an ellipse, but Desmos to the rescue: https://www.desmos.com/calculator/9hsixaciwt
@icecolbeveridge ooh this is a fun website!
@welshpixie It really is!
@icecolbeveridge I linked it to my friend, who replied with a link to this channel - https://www.youtube.com/watch?v=q8tVdjMo22E ^.^
@welshpixie Ingenious!
@icecolbeveridge oooh - fun!
A bit nicer if it's parameterised: https://www.desmos.com/calculator/bwg1jtlxm6