The need of the human mind for contrast has its roots in the mind's age-old habit of looking for differences and likenesses. When the mind can find no differences and no likenesses, as is the case when monotony is present, it restlessly, then resentfully, and at last frantically seeks for contrast that it may again busy itself with observing differences and likenesses.
Maren ElwoodContrast is the intangible ingredient, the catalyst that makes life exciting. The human mind rejects monotony even to the point of destroying itself in madness, when monotony is forced upon it for too long. ... Contrast gives variety and interest, whether it be in the universe as a whole with its light and darkness, its ceaseless motion and constant change, its creation of worlds and destruction of others.
Maren Elwood