It is more than a cosmetic tool. It sets the background for our experience of a space. The placement of color reinforces our reading of a building's design by articulating certain elements and organizing them for the viewer. Most people in the industrialized world conduct their lives indoors, enclosed by man-made environments. Design professionals must pay greater attention to human psychological and physiological responses to these artificial surroundings.
People are sensitive to color.
The human eye can actually distinguish approximately two and a half million different colors. The right hues can whet the appetite, soothe the spirit and stimulate the mind. But the wrong colors or the wrong combination of colors can have a very negative effect. Even a slight variation can nauseate, create aggression or cause drowsiness. The answer to this question actually lies in an enormous body of factual information and scientific research which is almost never put into practice.