pixels = W:1024 H:1024

x = from 0 to 10 W
y = from 0 to 10 H

ax = xor_value_fbm2(x, y)
ay = xor_value_fbm2(y, x)

s = 2
bx = xor_value_fbm2(x + s*ax, y + s*ay)
by = xor_value_fbm2(x + s*ay, y + s*ax)

s = 3
r = xor_value_fbm2(x + s*bx, y + s*by)*0.5 + 0.5
g = r
b = r
