understanding which parts of the stories can not be visualize

now a days everything could be visualize with the help of computers or extra effects but you can not expose any mans feelings you just put the scene into different parts and combined them to understand what the actor is feeling really so every medium has its limitation.what the masters call tempo, montage some extra scenes makes the special effects as the director things appropriate for the stories to understand.so it is important to understand which part of stories could not visualize with in budget and could not visualize at all, its up to directors imagination.