So great! A lot of those are mechanical styles I'd never seen before. 😲 So these are made using LEGO plus other components, then..?

For anyone who wants more, Rube Goldberg machines are often a genesis point for 'marble machines.' Two of my favorites are from the game show PythagoraSwitch and the wonderful Wintergatan music machine.

(the latter two links are YT videos, btw)