There was a lesson quite some time ago where we were asked to create an Animatic story board using jelly babies as a preliminary exercise. The reason we had to do this was to get an idea of how the whole story would look like when we make a real version of it with the members of my group. This was before we actually started our thriller piece. While we were doing this we started to learn what the 180° Rule and the Match-cut were.
First of all the 180° rule is a basic guideline in film making 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.