This is Citrus clock designed by Anna Grame. The Citrus is a clock powered by the energy of lemon. A single lemon is able to keep the clock running 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.
