84. Continuous design in ceiling or carpet weakens the size effect; hence rugs which break the continuity by being laid across the room instead of lengthwise are preferable. (See Diagrams and [¶ 81].)
85. It is a safe rule to do a small or narrow room in harmonies of analogy or related colors, colors of a light tone and of receding character. Apart from any effect which color may possess decoratively or pictorially, its value cannot be overestimated in its application to the laws of proportion.
86. Borders may be safely used on the wall or on the carpet of any large room with high ceiling, but wall friezes should be avoided where the ceilings are low, for they foreshorten the height effect.
87. We would avoid borders on the floor of a small room to make it look larger, and we would use wide borders in a large room with a low ceiling so that the floor may be foreshortened.