Walter Murch on Editing

 The first rule is emotion, which makes the viewer feel the way you want them to feel. The second is story, this tells the audience what is happening and how the story advances. Rhythm paces the story. The forth rule is eye-trace, this is used to make the viewer look where you want them to look. The 2D plane is used to represent 3D objects in a 2D world. The sixth is the 3D space of action. This is used to make the objects move in a 3D space coherently. The first three are much more important because they are all united.