Examples of highly regular forms occurring in biological systems. Most of these forms are simple enough that it seems immediately plausible that they could in effect be generated by simple programs. The majority show either simple geometrical shapes, or repetition of identical elements. A few, however, show various types of nesting. Note that there seems to be no obvious correlation between the sophistication of a form and when in geological time it first appeared.

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