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 resul