An idea for pi day but it's only January

Picture by Dennis Wilkinson

This is a fascinating example of the beautiful mathematics buried in simple physical theories.

https://www.youtube.com/watch?v=HEfHFsfGXjs&t=16s

If you also watch the "explainer" video, you'll see an explanation of how the algebraic expressions you probably already know can be transformed into geometrical objects.

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