If you ever wondered how spots and stribes on animals "know where to appear", I can highly recommend Phillip Ball's three-book series "Nature's Patterns: A Tapestry in Three Parts", particularly "Shapes"
goodreads.com/book/show/929617

Very accessible and illuminating on a complex topic.

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The theory behind is based on reaction-diffusion equations, if you want to go deeper into the technical stuff.

The pictures are borrowed from this scientific review article also by Philip Ball and has a comprehensive overview of the subject, showing how the theory ranges from waves i na petri dish to stribes on a zebrafish or ripples on a sand dune.

Great stuff!
royalsocietypublishing.org/doi

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