The body color ârises as a result of the incident light and the specific absorption properties of the surface. Therefore, the tri-stimulus value of a body color can only be determined in combination with the type of light with which it is illuminated. In addition to hue, brightness and saturation, the body color of an object is also defined by the reflectance. When illuminating colored walls or objects with colored light, the reciprocal effect of light color and body color is paramount. This interplay is the basis of subtractive color mixing. The chromatic effects can be intensified or altered.