However, the key to the McCandless method is that one light of the primary pair is "cool" relative to the other. One may be blue (a cool color, i.e. higher kelvin temperature) and the other amber (a warm color, i.e. lower kelvin temperature). Thus, one fills the shadows left by the other in a way that produces a degree of depth which is striking and recognizable on the stage, similar to stage makeup in the way it exaggerates and clarifies the actors' faces.