Interactions between Persistent Structures in CA Code 20

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According to A New Kind of Science, after a few steps class 4 systems typically organize themselves to the point where definite structures become visible. The NKS book discusses such systems starting at page 281 (NKS|Online) and shows some samples of this behavior using 2-color, next-nearest neighbor, totalistic cellular automaton (CA) code 20.
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Contributed by: Daniel Arndt Alves (March 2011)
Open content licensed under CC BY-NC-SA
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"Interactions between Persistent Structures in CA Code 20"
http://demonstrations.wolfram.com/InteractionsBetweenPersistentStructuresInCACode20/
Wolfram Demonstrations Project
Published: March 7 2011