Rule 12d. The relation between the side walls and furniture, trim, etc., should be retained within the range of four values or less, as low light and dark.
Value Range of Side Walls and Ceilings
The ceiling and side walls in [Figure 459] are four values apart and in [Figure 463] this has been reduced to a one-value step. There seems to be a common average of three values as an acceptable and agreeable contrast. For dark rooms this would well be increased. For rooms with light side walls the contrast would be considerably lessened.
Rule 12e. The relation between side walls and ceiling should be within the range of three values or less, as high light and low light.
Hue Groupings
Hue Range for Wood Work and Walls
A wood stain should be closely related to the natural color of the wood. As this is usually a warm color we naturally find most of the wood stains included between the red and the yellow hue rectangles, inclusive of red and yellow green. Walnut then may be stained a deep shade of orange or red, but would not be adapted to a blue green stain. This arbitrary but wide range of hues of stained wood naturally affects the hue of the side walls. The plotting of the hues for the side walls, [Figure 457], shows a close relation to the hues of the stain to the wall. In no instance do we find the hue rectangle of the wood work more than three hues away from that of the walls. In four instances they are within two hue rectangles of each other and in one instance they are both within the same rectangle. This develops the fact that analogous or neighboring groupings of hues prevail in relating the hues of wood work and side walls.
Analogous Hues
An analogous group of hues is an arrangement based upon a selection of tints and shades within three rectangles of each other, as orange and yellow. These harmonize because yellow is mixed with and becomes a hue common to both. While the analogous arrangement of hues seems to be most commonly used, and with a result that seems to justify its adoption into general practice, there are other arrangements that are pleasing to the eye.