Citrus Clock

New clock design by Florian Dussopt, Julie Gerard, and Jérémie Renaud. From their website:

"This clock runs on the energy of a lemon, which powers it for a week or longer. This pedagogic project is a kind of shortcut intended to remind ourselves that nature, in spite of the various transformations to which we subject her, is still our direct energy source.
The somewhat magical dimension of the operation is in fact simple electrolysis, like a conventional electric battery."

See their website.