pixels = W:512 H:512

x = from 0 to 1 W
y = from 0 to 1 H

f = 20
k = xor_value_fbm2(x*f, y*f)
k = xor_value_fbm2(x*f + k, y*f - k)
k = xor_value_fbm2(x*f - k, y*f + k)

w = smoothstep(0.1, 0.9, x)
h = x + w*k

r = h
g = 0.32 + h/4
b = 1 - h
