At one extreme is a visual experience that is so bland that the viewer is not engaged. The human brain will reject under-stimulating information. At the other extreme is a visual experience that is so overdone, so chaotic that the viewer can't stand to look at it. The human brain rejects what it can not organize, what it can not understand. The visual task requires that we present a logical structure.
Color harmony delivers visual interest and a sense of order.
Harmony is a dynamic equilibrium. There are many theories for harmony. The following illustrations and descriptions present some basic formulas . Usually one of the three colors predominates. These opposing colors create maximum contrast and maximum stability.