180 degree rule
Overview
In filmmaking
Filmmaking
Filmmaking is the process of making a film, from an initial story, idea, or commission, through scriptwriting, casting, shooting, directing, editing, and screening the finished product before an audience that may result in a theatrical release or television program...

, the 180° rule is a basic guideline that states that two characters (or other elements) in the same scene should always have the same left/right relationship to each other. If the camera passes over the imaginary axis connecting the two subjects, it is called crossing the line. The new shot, from the opposite side, is known as a reverse angle.
In the example of a dialogue between two actors, if Justin (orange shirt in the diagram) is on the left and Drew (blue shirt) is on the right, then Justin should be facing right at all times, even when Drew is off the edge of the frame, and Drew should always be facing left.
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