Stochastic hill climbing: Sisyphus pushes an imageLast year, Slashdot published this interesting piece of work: Genetic evolution of the Mona Lisa. The idea is to approximate an image by a certain number of semitransparent polygons, randomly chosen. I liked very much the idea, and as every year I try to come up with some Christmas postcard related to maths or programming I gave it a try. So I