32. Gray is a medium between the two. While it renders an adjacent color less brilliant, it takes to itself at the same time a tint that is a complement of that adjacent color. In other words, gray by the side of green appears faintly pinkish.
33. Black is always desirable as an associate with luminous colors. Black does not associate as well with two colors, one of which is luminous and the other sombre, as when associated with two luminous colors.
ORANGE YELLOW YELLOW BLACK BLACK BLACK RED ORANGE RED
YELLOW GREEN ORANGE BLACK BLACK BLACK VIOLET YELLOW GREEN
_The green being yellowish and the violet reddish._
White is preferable when associated with a luminous and a sombre color. Thus,
RED ORANGE RED YELLOW WHITE WHITE WHITE WHITE BLUE BLUE VIOLET BLUE
ORANGE GREEN GREEN YELLOW WHITE WHITE WHITE WHITE VIOLET BLUE VIOLET VIOLET
_The violet being bluish, the green yellowish._
34. The harmony of analogy is a subject that is little understood. It may be color sequence, progression, development or succession.
[Illustration: Showing Four-Color Combinations. DIAGRAM IV and DIAGRAM V]
[Illustration: #SEQUENCE OF HARMONIES# DIAGRAM VI As these twenty-one sections are arranged, one has the layout for a suite of seven rooms; following the top line across in a light scale, the harmony is complete; following the center line across in a normal, the harmony is complete; so also with the bottom line in a lower scale. Follow the colors diagonally and you find they are repeats, or very close to repeats--red, russet, red, for instance; violet, violet, violet; blue, slate, blue; green, green, green; yellow, citrine, yellow; orange, orange, orange. To the colorist the combinations here suggested are full of inspiration.]
Thus we may combine red, green and blue by starting with crimson and maintaining the following sequence: Crimson, red, scarlet, orange, yellow, greenish yellow, green, bluish green, blue, violet, and with added red get back to crimson.
A room or a series of rooms may run to all colors and be still a harmony of analogy if the sequence or succession is gradual.
35. No more delightful harmonies can be imagined than those provided by nature. One may start with the brown of the earth and run into several shades of green, and from that touch upon yellow, and from yellow to orange, and from orange to red, and red to violet, and violet to the blue of the sky. Or one may follow the colorings and the proportion of colorings in flora and never go astray. (See ¶ 22.)