...actually, I'm not sure whether this one qualifies as "frivolity." Its level of "entertaining" and "intriguing" warrant a mention in spades, but frivolous it is not. Witness... my new favorite thing.
The comparison to DaVinci seems pretty apt to me! If you want a little more, here's the BBC clip that introduced me to Theo Jansen to begin with. I couldn't find it on youtube to embed it directly. Enjoy, and happy Friday!