Reaction Diffusion is an algorithm that mimics the chemical process that's responsible for a lot of patterns we see in the natural world. The stripes on a zebra, the spots on a cheetah or giraffe. Fish have these sorts of patterns, plants, coral, etc. And considering how often these patterns appear in nature, its amazing how little commercial software there is out there to create them. Here's a trick in Photoshop that, while not as full featured as a dedicated piece of software, can still make some really interesting reaction-diffusion type patterns.
https://www.youtube.com/watch?v=I6Vh_NOy70M
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