I just found these off the front page off torrentspy, but they're awesome nonetheless.
This one is a marble based binary adder machine. it's pretty amazing how people think of these type of designs. some people don't understand the intricacies of this design and think it's stupid because you can count faster in your head. In truth, if early mathematicians did not invent binary, the modern computer could not function as it does.
Uhm. Crazy. I have a hard enough time drawing simple lines with my tablet. I can't even imagine how professional artists draw digital paintings like this.