How coincidental. I was just looking at Vitruvian mantonight in my copy of Leonardo da Vinci Book: Journal of Inventions Pop-Up Blueprints. Disappointed it does nothing. Not recommended, the mechanisms are not all that good. https://www.youtube.com/watch?v=L4mruhVIbIk
(
kombu dashi,
Fri 16 May 2014, 8:01,
archived)