Somewhat depends on how big mostly is supposed to be. Even though written and verbal communication are at the root of material presentation, learning is a question of what goes on in the mind of the student. Patterns, causality, relations, even extracting theories can all be more heavily drawn from nonverbal reasoning. Certain subjects like science are going to be more strongly conveyed when supported by nonverbal presentations, which is one of the nice side effects of theories of mutliple intelligences.
