180 Degree Rule

The 180 degree rule is a filming guidline where two characters who are shown in the same scene should always have a left/right relationship to eachother. An Imaginary line is created when shooting, and the two characters can only be filmed on one side of the line; if the camera was to film from the other side of the line then it would not look right because they would be facing the opposite direction to the clip beforehand, and would confuse the viewer.