Hello, hello. Here's a video of a piano-ish thing which has the distinction of being designed by Leonardo da Vinci*. All of the articles springing up in its wake seem inclined to refer to a "wacky piano," or a "crazy piano," whereas nobody seems to have thought of "the world's most ambitious hurdy-gurdy." But it sounds quite nice. If you don't have time to take in the whole thing, it's worth at least listening to the nifty string-quartet effect on Boccherini's "Celebrated Minuet" at 6:44.
*It is by no means an inconsiderable distinction either that it would appear that the fellow who is playing it built it.