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Spent the day populating my Blender asset library and almost forgot about doing something to post.
Tried to do a few 'quick' things, but nothing worked, so here's the least-poor one.
This is a 'strange attractor' based on the Lotka–Volterra equations which are apparently 'frequently used to describe the dynamics of biological systems in which two species interact, one as a predator and the other as prey'.
From 2018 Picture A Day