With a Mindstorms RCX kit and a lot of creative ingenuity, Dan Kressin managed to recreate an entire Donkey Kong level using only Legos.
In all, it took him about three months or 110-120 hours to complete, and the end result is a fully automatic and synchronized art piece that even plays the Donkey Kong theme song while the action happens.
From the front:
And behind:
[Via: Gizmodo]