180 Degree Rule - Dark Knight

..During my film I will be following a term called "The 180 degree rule" which  is a basic guideline in film making that states that two characters in the same scene should always have the same left and right relationship to each other along a 180 degree angle  (on a straight line). This skill is used effectively in Batman - The Dark Knight during the interrogation scene between Batman and Joker. 

More of an insight on the 180 degree rule