Slawomir Zubrycki, a Polish guy very fond of da Vinci's works decided to build the organist viola, which unites features from the organ, the harpsichord and the viola. It looks like a grand piano from afar, but sounds completely different. Check out the video to hear it! The 61 strings, instead of being played by small hammers (as in traditional pianos), are stimulated by four swivel wheels coated in horsehair (the same material used in the bows to play the violin and cello). This intrument was a part of Leonardo's Codex Atlanticus, a 12 volume manuscript with many typer of projects.