24. If a rule can be applied we would say that no strong normal color should be used in large surfaces. If we were dealing with pigments we would say that if one-sixth of a side-wall is devoted to a frieze in green, the balance of the wall space should be treated with the same amount of red, mixed with the same amount of gray.
25. For a room that is small and well lighted the fresh tints are not as desirable as the gray shades or tertiaries in conjunction with secondaries.
COLOR IN LARGE OR SMALL ROOMS
26. For a large room well lighted, yellow, red and orange in delicate shades are not as desirable as orange, violet and russet in light shades. This rule, however, may be reversed for a large room that is dimly lighted.
A superabundance of light gives an uncomfortable glare.
27. One may mechanically obtain harmony of analogy in proper proportions for the treatment of a room or a design by following the guidance of [Diagram I]. It will be noted in this diagram that the inner circle is blue, red and yellow, the primary colors.
The second circle is composed of the secondaries; the third circle, the tertiaries, and the outer circle, the quaternaries.