I'm fascinated by a lot of things I don't understand, and I'm really grateful for that.

https://www.youtube.com/watch?v=ldxFjLJ3rVY

Escher's most mathematically interesting piece

YouTube
@hotdogsladies it's such a good video and the maths completely baffled me
@hotdogsladies Wow, that was really interesting
@hotdogsladies Today I learned about the Droste Effect. Thank you, Merlin!