Crossing the Line (180-Degree Rule)
Definition
The 180-Degree Rule is a fundamental principle of film grammar that states that two characters (or a character and an object) in a scene should maintain a consistent left-right spatial relationship with each other across all shots in the scene. An imaginary line (the "axis of action" or "the line") is drawn between the two subjects, and the camera should always remain on one side of this line. If the camera "crosses the line," the spatial relationship between the subjects appears to reverse, which can be disorienting for the audience. Intentionally crossing the line can be used as a creative device to create confusion or disorientation.
Contextual Usage
The director reviews the footage and spots a problem: "We've crossed the line between these two shots. In the wide shot, Character A is on the left and Character B is on the right. But in this close-up, they've switched sides. The editor won't be able to cut between these two shots without confusing the audience. We need to go back and get a bridging shot that takes the audience across the line."
About this section
Production — or "principal photography" — is the phase in which the film or video is actually shot. It is the most visible and, typically, the most expensive phase of the entire process. Every day on ...
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