Combinations of Colors
Clearly, the preservation of the natural state of a building's construction materials depends, in large part, on remaining faithful to their natural colors. Thus, we can begin to understand Wright's choice of colors and their shades.
The combinations of colors in a building tend to echo all of the colors in Nature that can be found on the site, as well as those colors imparted by the building materials.
For furniture and accent pieces, Mr. Wright might suggest colors from Nature. Classic fine arts statuary was always appropriate, with their marble-like textures and colors. Red brick was both a building material and a warm color, particularly in the Usonian homes.
It soon becomes evident, that to a large extent, color was chosen by Nature rather than by the architect.