It's amazing what people do with legos but how do they get so many parts in the first place. This contraption is mind blowing in the amount of moving parts. Warning - you may want to turn down your volume.
https://www.youtube.com/watch?v=sUtS52lqL5w?version=3Oh my, it became more and
Oh my, it became more and more sophisticated! Take a look at the older versions: https://www.robotshop.com/letsmakerobots/node/25597