Depicting the scene onstage illustrates the horror of the murders. Witnessing the murders makes them very real and extinguishes any empathy for Macbeth's character. The act exposes who the man has become.
Because this helps you to stay organized. It helps to keep up on track of things when writing a research paper. Without mapping (planning, graphing, etc.) you won't have a straight research. You want to keep everything in order, to where it's all nice and neat, so you will know how to put things in order or whatever. I hope I helped love!
