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Patterns from various two-dimensional substitution systems. In each case what is shown is the pattern obtained after five steps of evolution according to the rules on the right, starting with a single black square.

Patterns from various two-dimensional substitution systems. In each case what is shown is the pattern obtained after five steps of evolution according to the rules on the right, starting with a single black square.

From Stephen Wolfram: A New Kind of Science [citation]