These “thread fields” were originally created as table top constructions strung with actual thread from a sewing supply store at eighth inch intervals in six different colors. In setting them up to photograph, I had trouble getting the lighting even so I decided to recreated them in the computer with four pixel “threads” in the same color sequence. In all three of these studies the thread colors are the same.
So it follows that in the two dual background pieces the thread colors are identical on both sides. The apparent differences are due to the way the eye perceives these threads against the distinct backgrounds. The spaces between the threads in the white piece are just as white as the borders but the eye sees a color wash in those spaces thereby creating the pastel bands that give the picture its general structure.