#https://www.shadertoy.com/view/XsfcWj

pixels = W:1024 H:1024

x = from -1.2 to 1.2 W
y = from -1.2 to 1.2 H

t = 4.55
a = mod(t, 2*PI)
n = 1.5 + 0.5 * cos(9.0 * t)
i = 2.0

[loop start:16
w = x*cos(a) - y*sin(a)
y = x*sin(a) + y*cos(a)
x = w
fx = abs(-0.5 + fract(x*i)) / i
fy = abs(-0.5 + fract(y*i)) / i
n = n - fx - fy
i = i*1.23
loop end]


r = -n
g = abs(n)
b = n*n
