themselves would draw little attention, but when they are focused on the structure, they make people notice what was previously ignored. That’s how the resources such as illustrations work. Resources should make the audience want to listen. The human mind is capable of miraculous feats, but it is hard-pressed to concentrate for any extended period of time. The mind will tend to wander during a presentation unless it is held by the color and clarification of illustrations, humor, and supportive resources.