Interaction of Color Example 9 (Color Mixture in Paper)

In this figure, we superimpose part of a brown rectangle on a red-orange rectangle. First we pass our eyes from left to right several times across the overlapping area, in which the mixture should appear. After several passages we see the red appears to come through the brown at the left, and the brown seems to come through the red at the right border of the overlap. This is proof we have true mixture. It is easy to see that the right edge of the brown rectangle has a heavier boundary than the left edge of the red. Therefore this mixture contains more brown than red. Thus, the brown is on top, and is dominant in the mixture.