pixels = W:1024 H:1024

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

ax = xor_value_fbm2(x, y)
ay = xor_value_fbm2(y+ 5, x + 7)

s = 10
bx = xor_value_fbm2(x + s*ax, y + s*ay)
by = xor_value_fbm2(x + s*ay, y + s*ax)

s = 11
r = xor_value_fbm2(x + s*bx, y + s*by)*0.5 + 0.5
g = r
b = r
