Related, checkout matthias wendel who does woodwork and lego contraptions
Lego domino row building machine
https://www.youtube.com/watch?v=de4xdOVVROQ
Also, for other mechanical motions I really like watching thang
That Matthias video takes me back - one of the first channels I ever subscribed to back in 2007 because of this cool wooden marble adding machine: https://www.youtube.com/watch?v=GcDshWmhF4A
https://www.youtube.com/user/akiyuky/videos
Akiyuky is apparently a process engineer in Japan, and posts impressive lego-based contraptions.
A lot of of them are for GBC, or "Great Ball Contraption", a collaborative project to make lego modules whose sole purpose is to move standard lego balls from one point to another. You'll often see collections of these at lego conventions. For example:
https://www.youtube.com/watch?v=_cbpNV8ivME