Audience space — shapes camera position, sight lines, emotional distance from action. Classic convention: camera sits in auditorium, actors play toward lens.
The auditorium fundamentally determines how a scene is constructed. Not the stage, not the actors—the empty space in between. Sit in a seat in the cinema, and you find yourself exactly where the camera must later be positioned. This is not by chance, but a convention from the theater era that continues to resonate today.
On set, this concretely means: the actors play facing the camera because they are playing to an imaginary audience—and the camera is situated right in the middle. When an actor looks at another, they are not looking directly into the lens, but slightly past it, towards the "audience." This spatial logic is called the fourth wall. It is invisible, but it structures every shot. The camera angle is determined by the seat. Sit in the third row, center—that's where the camera is. Sit up in the balcony—that's where your high angle is shot.
Emotional proximity is directly related to the position in the auditorium. A close-up corresponds to a front-row seat, the most intimate proximity. A long shot corresponds to the back row or the balcony—distance creates overview. Medium shots work with the normal seating position. If you position the camera too far to the side, you break this convention—intentionally or unintentionally—and the viewer immediately senses that they are sitting "outside" the action.
In practice, this becomes relevant when you think about shot-reverse-shot sequences. Both camera positions must remain "within the auditorium," meaning on the same side of the imaginary axis (cf. axis of action). Otherwise, the spatial orientation jumps, and the viewer loses track. This is not "wrong," but it creates irritation—sometimes desired, mostly unwanted.
Modern: Many directors consciously break out of this theatrical logic, placing the camera to the side or behind the actors. This creates realism, cinema rather than theater. But even then, the auditorium orientation still functions subconsciously—because each of us learned cinema in the theater.