same but different (in a way…)
Hi-resolution picture: CLICK ON IT TO ZOOM!
The two largest rectangles have the same color average: same colors in the same proportions.
The one on the top is made of 4 layers, one color per layer, one spatial frequency per color, and the angles between the layers are “optimized” in order to get rid of moiré effects.
On the other one there’s also 4 layers, but with a unique frequency, a 45° rotation and the colors are randomly diffused.
Both are trying to “match” the average color of the background and in both paint is covering 60% of the paper.
The 1st one is almost invisible, the second appears to contain intense colors.