180-degree rule

The 180° rule is a basic film editing guideline that states that two people in the same scene should always have the same left/right relationship to each other. If the camera passes over the imaginary line connecting the two people, it is called crossing the line. The new shot, from the opposite side, is known as a reverse angle.As you can see in this example, the camera cannot pass the 180-degree line in front, otherwise our viewer would get confused.