Mutually-catalytic self-replicating reaction-diffusion spots
Two coupled Gray-Scott systems. The large spots can only replicate when full of small red spots. Likewise the red spots can only grow inside the large spots - outside of the large spots they die out. The large spots usually inherit their small spots when they replicate - those that don't will no longer replicate. In the starting pattern only the central spot is seeded with small spots. The other two spots don't replicate at all. Created with open source software: http://code.google.com/p/reaction-dif...