This applet displays a reactiondiffusion system. Begin exploring by using the "Preset" choice at the bottom  and the "Restart" button below it  to see some of the possible configurations. Configurable parameters include a number of manual colourmap controls (on the left)  and six main parameters of the reactiondiffusion system (on the right). Take care if using the other controls on the right. They are usually very sensitive. The model is a cellular automaton, based on the vonNeumann neighbourhood. It is based on the GrayScott model, and was taken from John E. Pearson's Complex Patterns in a Simple System  Science, 261, 189, 9 July 1993. More details about the type of system used can be found at the [Xmorphia web site]. Toroidial boundary constraints are appled, so the images will tesselate seamlessly. Optionally, a bumpmap technique is employed to give the images a sense of depth.
Geometric noteWhile reactiondiffusion systems generally attempt to obscure the underlying cellular lattice, it still emerges under some configurations which magify chaotic effects from scall scales.Also, the "saturated" state in the automaton is often a chequerboard pattern. For these reasons, it seems that reactiondiffusion systems on a hexagonal grid would be interesting to explore (there is no equivalent to the chequerboard pattern on the [honeycomb neighbourhood]).
