Thanks to people who pointed out the above video. Fifteen uncoupled simple pendulums of monotonically increasing lengths dance together to produce visual travelling waves, standing waves, beating, and (seemingly – I’ll come back to this) random motion.
I love some of the comments:
“Does it do the same pattern every time or is it random?”
(It’s the same every time.)
“Totally fake, you can see the fishing line and at 2:01 in the upper left corner you see a guy with a blow dryer aiming it at the thing.”
“That’s cool….chaos follows order follows chaos follows……”
“A life lesson… :-)”
To the last comment I would add: actually it only looks random, but there is a deeper pattern going on underneath. Another (bigger?) life lesson?