If a writer knows enough about what he is writing about, he may omit things that he knows. The dignity of movement of an iceberg is due to only one ninth of it being above water.
The body is only a tool of the mind. What the mind dictates the body will have to obey. Now I do not even think of water. I do not miss it at all.... I see I can do anything.
There is seven-eights of it under water for every part that shows. Anything you know you can eliminate and it only strengthens your iceberg. It is the part that doesn't show. If a writer omits something because he does not know it then there is a hole in the story.