#MCell 2.0 #GAME Cyclic CA #RULE R1/T3/C4/NM #BOARD 140x140 #SPEED 0 #WRAP 1 #D #D Self-Correcting Perfect Spirals #D =============================== #D #D The Cyclic Cellular Automaton with range 1 box ("Moore") #D neighborhood, threshold 3, and 4 colors is a particularly interesting #D excitable system. From a uniform random configuration it quickly #D self-organizes into a chaotic soup with large length scale similar in #D structure to the equilibrium of turbulen.xpt. But later on, often after #D more than one hundred updates, widely separated stable spiral cores #D emerge and slowly take over the lattice. #D #D Spirals characteristic of this rule are particularly interesting for #D three reasons. First, they are NOT stable periodic objects (spo's) in the #D sense of Pritikin's monster (dan10.xpt) or the spiral cores of #D prototypical GH and CCA rules. Rather, external patterns can destabilize #D the boundary layer of the spiral. Secondly, the emergent spiral pattern #D away from the boundary is perfect, i.e. without any 'glitches.' The #D spirals of more aggressive excitable dynamics often work their way around #D particularly stubborn obstacles, leaving residual anomalies. But based on #D extensive experimentation it appears that the spirals of this rule #D overrun any disordered environment without the slightest trace of the #D displaced configuration. Thirdly, it would appear that spiral cores arise #D either within the first several hundred updates or virtually never. Our #D evidence for the last observation is the most impressionistic, but it #D seems that the time to nucleation from uniform randomness has a very thin #D tail. 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