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Physical Review Letters – 10 September 2004
Volume 93, Issue 11

Phase of a cyclic cellular automaton, where the color of a cell changes if the number of nearby same-color cells is above a threshold value. The phase shown (static blocks of solid color) corresponds to a high threshold. Lowering the threshold produces more organized phases: first, "turbulent" patterns, then spiral waves. At very low thresholds though, less complex oscillating patterns are produced, in which each cell cycles through all the colors. [Cosma Rohilla Shalizi, Kristina Lisa Shalizi, and Robert Haslinger, Phys. Rev. Lett. 93, 118701 (2004)]

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