812 Double Pendulums with Different Initial Conditions

This is what 812 double pendulums with different initial conditions look like https://t.co/jklEvfb5EI | https://t.co/ctsPCmFfEJ pic.twitter.com/jMar6rlRma

— Massimo (@Rainmaker1973) October 26, 2018

Pendulum Wave: Bowling Ball Edition

Go ahead: Take a look for yourself. It's pretty damn awesome! (I like demos.)

(Tip of the cap to Damien Storey.)

Harmonographs

A harmonograph is a drawing device that is constructed of coupled pendula. Here are some instructions for how to make one based on triple pendula. Oxford's Museum of the History of Science apparently houses this one, although it wasn't there the last time I visited. I also remember seeing something along these lines (or maybe it is even an example of one?) at KITP.

And, of course, this automatically makes me think of the Spirograph drawing set that I had as a kid.

(Tip of the cap to the National Museum of Mathematics.)