le corbusier developed a color system, salubra, which establishes an architectural polychromy in modern buildings in accordance with nature and needs of each person. le corbusier describes the range as ” keyboard.. each of us will be touched by such or such a harmony.” creating harmony through color and creating harmony through proportion were parallel processes. “color.. mister psychiastrist, is it not an important tool in diagnosis?” he wrote.

source: le corbusier in detail, samuel 

and this site.