180° Rule
180° Rule – This is the rule which states that if two people are filmed in a sequence there is an invisible line between them and the camera should only be positioned anywhere within the 180 degrees on one side of the line. Crossing the line results in a certain particular jump, where is appears that the two people suddenly switched places. A simple way to keep from crossing the line If two people are talking to each other in a scene is that one person should always be looking left and the other looking right.