This is a simulation of the Gray-Scott reaction-diffusion model running on the GPU. In such systems, an auto-catalytic reaction involving two chemical species is happenning concurrently with diffusion. Despite the apparent simplicity of the model, simulating it with cherry-picked sets of parameters produces a wide range of emerging behaviors.

• Run it in your browser : https://www.shadertoy.com/view/lXXcz7
• Detailed article : https://pierre-couy.dev/simulations/2024/09/gray-scott-shader.html

It's not a trick, if you're wondering. There actually is something to see.