“Behold how good and joyful a thing it is, brethren, to dwell together in unity.” So said the Psalmist, and his words might be applied to the unity of colors. He did not mean that everybody shall be of a like mind; there will always be differences of character among relations and the best of friends; but they will agree to differ; and their very differences make their unity or harmony the more real and good. Such is the harmony among colors; a union of differences or contrasts, as well as of similarities; of variety of values of color related into a harmonious unity.