Perspectives define aesthetics.

A cinematographer rarely asks how much light a scene needs. The more useful question is where it should fall, where it should be held back, and what the audience ought to notice first. Professional lighting on a film set follows its own grammar around those decisions: the key light that establishes form, the fill that controls how deep a shadow runs, the backlight that lifts a subject from its surroundings, each placed with intent. Coverage, simply making everything visib

Long before anyone reads a sign, they read the light. People move toward the bright part of a room and slow down at the dim edge of it, registering brightness and contrast as direction without ever deciding to.