Take look at this, great fun
https://youtu.be/IvUU8joBb1Q
Crazy stuff! If that thing ever tipped over, you'd never find all of the marbles.
Fun to watch, but I think he may have lost his marbles already! I just watched one of the building videos linked from the one above (about the program part). Wow...
Yeah, there's some great stuff on his youtube channel. Fascinating stuff