Color variation in costumes can also be hidden in dark scenes. Changes in time and locale are often achieved through lighting. In a unit set, it may be up to the lighting designer to determine whether a scene is taking place the next day, a few hours later, etc. Sound may also affect changes in lighting. Primarily in dance and concerts, light changes may be motivated by tempo or beat changes in addition to choreography.
Lighting often supports the mood of a production.
In musicals, dance pieces and concerts, the mood is often dictated by the music. Blocking Blocking affects lighting by helping to dictate how acting areas need to be arranged. The lighting designer can often analyze a groundplan accurately to figure out how action will flow around a set. Yet, by watching the actual blocking during rehearsals, the lighting designer may see interpretations for the use of space that the designer did not initially consider. Entrances, large furniture pieces, etc. may call for the need of specials or isolation where the designer did not formally deem necessary.