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Title: Careful
Review: There's a danger in confusing two different things together. One can use affine fractals to draw pictures of mountain landscapes, but the rules of fractal construction teach you absolutely nothing about the physics or geology of mountain formation. Likewise, you will learn nothing about leopards simply from constructing patterns that look like leopard spots. Computational universality is very powerful: you can compute any computable number or function, but the way that those numbers and functions appear empirically in nature will remain not explained. To believe that nature is like a ca says nothing unless the program is specified. where did the program come from? I recommend instead the chapters on symmetry as the basis of physical law in Wigner's Symmetries and Reflections, a very beautiful book.
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