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

cross-posted from: https://mastodon.social/users/wonderofscience/statuses/111940928160260328

Optical Illusion

These rows are perfectly horizontal and are not moving. A mind-bending anomalous motion variation of the Café wall illusion by Akiyoshi Kitaoka.

Source: http://www.psy.ritsumei.ac.jp/akitaoka/motion30e.html

Image transcription: Rows of black and white zigzag patterns forming 2x2 checkerboards on a grey background create an optical illusion of warping and motion.

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(Originally published on mastodon.social: 2024-02-16)

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