Check out this amazing LEGO sculpture posted on YouTube by JK Brickworks. The kinetic sculpture depicts the myth of Sisyphus, as he pushes the boulder endlessly. The motions are very well done and the attention to detail is truly impressive. We also get a nice long look at the insides and a description of the key components that make it work.
A tip of hat to Dave Johnson and his sculpture titled Sisyphus Testing Shoes may be in order. The two sculptures seem very similar. Of course, I don't know the full story; could this be a case of independent invention? At any rate, it's a brilliant example of artistry and ingenuity.
[ Thanks Martin! ]