Diffusion Limited Aggregation

The "D" key toggles the drawing of the particles. This one can take up to a whole day to work on an image. It uses DLA (Diffusion Limited Aggregation, how snowflakes and dustballs form) to move particles around the image and stick them to pixels of a complementary threshold. On sticking it tones it's under pixel to that threshold and re-spawns. The image is of an inverted photo taken of Pete Doherty of the Libertines in The Bricklayer in Shoreditch (all photos are taken by me, and yes I was very drunk when I took that shot).