Spiral waves in the Belousov-Zhabotinsky reaction.
The Belousov-Zhabotinsky (BZ) reaction is an example of a temporally oscillating chemical
reaction.

Procedural/randomic modeling and shading.

Software: Houdini, Nuke, Resolve.

Reaction references: A. Turner, "A simple model of the Belousov-Zhabotinsky reaction from first principles and scipython.com.