In interior design, the concept of warm and cool colors is particularly applied. Warm colors are hues of red through yellow-green, including browns and tans. Cool colors are hues of blue-green through blue-violet, including most grays. The use of the contrast between warm and cool colors reflects perceptual and psychological effects. In interior design and fashion, warm colors are used to stimulate the viewer, and cool colors to calm or relax. Warm colors are also advancing, while cool colors appear to recede, ideal for small rooms.