The 180° rule is a basic film editing 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 an action scene, such as a car chase, if a vehicle leaves the right side of the frame in one shot, it should enter from the left side of the frame in the next shot. Avoiding crossing the line is a problem that those learning filmcraft can struggle with. In the above example with the car chase, a possible solution is to begin the second cut with the car driving into frame from the "wrong" side. Although this may be wrong in the geographic sense on set, it looks more natural to the viewer. Another possibility is to insert a "buffer shot" of the subject head-on (or from behind) to help the viewer understand the camera movement. Less