Help to identify weird mirrored toy

[absolutelynice]

Hello all,

Does anybody know what the hell this is...

[milkypuppy]

I'm not really sure what it's called but I found a Youtube video that calls it an "Optical Pendulum". I also stumbled upon one on Instagram and it was called a "Spherical Mirror and Pendulum" there.

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

https://www.instagram.com/p/96v4hIqJLB/