Reaction-Diffusion Patterns

Begin with the question

Reaction-Diffusion Patterns starts with one useful question: The chemistry-inspired rules behind spots, stripes, and coral-like textures.

Reaction-diffusion models pair spreading with local activation or inhibition. The point is not to memorize a label. It is to notice a repeatable relationship, then test what changes when one part of that relationship moves. Instructions become images when you give a rule room to repeat.

Build a working model

The main diagram is a soft gradient texture evolving into leopard-like spots. It gives the eye a before-and-after view rather than asking it to infer the rule from a paragraph alone.

A working model can be simple and still be powerful: name the parts, hold one choice steady, change another, and compare the result. That is how this topic becomes something you can inspect instead of only admire.

• ✳Name the part that repeats.
• ✳Choose one change to test.
• ✳Compare the new result with the first one.

Try a small experiment

Compare a spot-producing parameter pair with a stripe-producing pair. Open Start a sketch when it fits the question, and keep a note of the setting, rule, or observation that changes the picture most clearly.

If this guide does not need a generator, recreate the diagram on paper: trace the underlying structure first, then add the decorative detail. The structure should still read before the decoration arrives.

• ✳Start with: Soft gradient texture evolving into leopard-like spots.
• ✳Make two variations, changing only one choice each time.
• ✳Keep the version that teaches you the most, not only the prettiest one.

What to notice next

The diagrams are models of a mechanism, not a claim that every animal pattern uses one equation. Return to Reaction-Diffusion Patterns in a photograph, a built object, or another artwork. Ask where the model fits and where it does not.

That habit—observe, model, test, and revise—connects this lesson to every other guide in the Generative Systems collection.