Light is not applied to a room at the end; it is one of the materials from which the room is made.
The direction and duration of daylight influence how a plan should be organized, where activities belong and which surfaces can carry depth. A northern room asks for different decisions than a west-facing room that changes dramatically through the afternoon.
We study light through observation, drawings and material samples. Reflective surfaces can extend it, while deeper tones give it contrast. Openings between rooms allow daylight to become part of circulation rather than remaining contained at the facade.
Artificial lighting then supports this spatial logic. It should clarify use and atmosphere after dark without flattening the variation that gives the interior its character.