Yin Yang Fractal Chain

A little weekend project. My first Shadertoy made from scratch. I noticed that a yin-yang shape is made of two smaller semi-circles and one twice as large. So I thought, what if the larger ones also serve as the small ones in a larger set of shapes? And so on. You can see the effect running live in your browser on Shadertoy as well as see and modify the source code: https://www.shadertoy.com/view/tclyz8