pixels = W:1024 H:1024

x = from -1 to 1 W
y = from -1 to 1 H

t = 64.0
a = atan2(y, x)
radius = sqrt(x*x + y*y)
mt = sin(t + a) + sin(t + 2.0 * a) + 0.3 * cos(t + 8.0 * a)
offset = mt + 0.1 * sin(60.0 * a)

f = offset + log(12.0 * radius)
f = mod(f, 1.0) * PI

g = 0.5 + 0.5*sin(f)

