Manipulating Light: Direction and Balance
The direction of the light within a scene will suggest the time of day, the type of location, and the mood of that scene. It will also model the objects within a scene, bringing out their shape and texture, or perhaps intentionally not bringing out their shape and texture. The bright, cheery daytime dining room may become a sinister, shadowy nighttime scene by changing the placement of just a few lights.
The primary source of illumination in any given scene, which establishes the perceived direction and character of the light, ...