In lighting design, diffuse light refers to a rather "soft", uniformly distributed light. Rooms and surfaces thus appear uniformly bright, with low contrasts and shadowing. To create diffuse light, diffuse distribution large-area luminaires are used, or reflection via the room surfaces. If the surface is rough or matt or has unevenness, the light is reflected
in many different directions. This scatters the light and spreads it over a wide angle. Examples in nature are clouds that scatter sunlight or, indoors, illuminated walls or ceilings that distribute the light evenly throughout the room.