Optical Illusions (Score 1)

A bit of a side note, but when two colors are put next two each other, often times a third color appears near where the two colors meet. The most extreme example is the old black and white grid; near the intersections of the white lines, black spots will appear; putting a purple square on a larger yellow square will make the yellow turn color. A whole art movement is based on adjacent colors and the resultant perceptions: pointillism.