xkcd #2924: Pendulum Types
https://xkcd.com/2924
Alt text:
The creepy fingers that grow from a vibrating cornstarch-water mix can be modeled as a chain of inverted vertical pendulums (DOI:10.1039/c4sm00265b) and are believed to be the fingers of Maxwell's Demon trying to push through into our universe.
https://explainxkcd.com/2924
Inverted pendulum becomes stable when vibrated?
https://youtu.be/5oGYCxkgnHQ
It works with double pendulums too
https://youtu.be/gnn21smGVrQ
That was surprisingly loud, I almost fell off the toilet
Oh, wow! That's cool. Thanks