As anime and manga matured as an artistic medium of storytelling, both started to create a unique language of visual metaphor. Some people view these metaphors as visual shorthand and like the animetion techniques not only save time and efffort but are tried and true tools of any master animetor. I call it the symbolic language of anime and manga. "Symbolic" in both how it is a visual picture and also of how it represents much more than the sum of it's lines and ink.