Found this on r/gifs at a [6], and I thought all you lovely Ents would like it!

I have such a strange boner

I stared at this for like 20 minutes and now I feel like I have a better grasp on geometry.

me gusta

spyrogif

It's always on the lines! Always!

It is four trammels of Archimedes in one device. Plus some circles. Sweet.

this is one of the coolest gifs i've seen like that, it goes round on slopes yet it follows a straight line.