A model of the famous toy known as a spirograph. A circle of radius r (see blue circle below) is allowed to roll around the inside of a circle of radius R (see black circle below). We assume that the ...

At first glance the monicker “spirograph” seems wrong ... It’s so obscure LEGO doesn’t even provide the gear in their online building program LEGO Digital Designer, though (of course ...

“Spirograph products can be found online and in retailers all across the country and internationally, from big mass market chains to independent toys stores, museum gift shops, drug ...

[Tuchman] starts with a quick proof-of-concept using an actual plastic Spirograph toy to make sure it isn’t a totally unworkable idea. Unsurprisingly, the plastic is too flexible to give a ...