A particle simulation, designed to illustrate life-like behaviour emerging from particles obeying a set of simple rules. Set as a live wallpaper, and turn your phone into the ultimate Petri dish!

Each particle exerts a force on other nearby particles, depending on their species (represented by the different colours). This can either be a repulsion or an attraction, and is not necessarily symmetric. For example, red can be attracted to green, but green could be repulsed by red, which would result in red "chasing" green.