ednl 🇪🇺Wonderful analysis and animated recreation of M.C. Escher's "Picture Gallery" by 3B1B: https://www.youtube.com/watch?v=ldxFjLJ3rVY
The 2003 paper by De Smit and Lenstra who as number theorists were intimately familiar with elliptic functions ("doubly periodic complex functions") at the heart of the image https://pub.math.leidenuniv.nl/~smitbde/papers/2003-de_smit-lenstra-escher.pdf
I grew up in Baarn where Escher lived for a while but only learned later that he lived on the same street! D'oh. Of course we were separated by 35 years.
