Nils-Hero Lindemann. FIDE Profile, Github account.
The Source Code of my user picture:
rule Y {
CIRCLE {
brightness 1 // -1 to 1
saturation 1 // -1 to 1
hue 230 // 1 to 360
}
Y {
rotate 20 // 1 to 360
x 1.5
size 0.98
alpha -0.03 // -1 to 1
hue -.8
}
}
startshape Y
It uses recursion – the function Y draws a circle (the bottom left most in the image) and then calls itself with slightly modified parameters for the circle – rotate a bit, move right to 1.5 x self size, a bit smaller, a bit more transparency, a bit less blue.