denied a symmetry with a simple folding of the surface to be 'home for a flying machine. The mission is to increase the chances of spreading the seed far from the tree that generated it.
The complexity of this simple "leaf evolved" generates an enormous functional and poetic power; morphogenesis, the 'aerodynamics, the location of the weights return a perfect design. A design did not manage to communicate, but only for a fall. Citing a passage from the opening sentence of Hubert " Hatred", a beautiful film of 1995 written and directed by Mathieu Kassovitz: "The problem is not the fall but the landing" .