29 seconds about the synergy of words and visuals.
Looking for a book? Try Garr Reynolds’ Presentation Zen: Simple Ideas on Presentation Design and Delivery. Here’s a sample:
Ask yourself this: What information are you representing with the written word…that you could replace with a photograph, image or graphic? You still need text for labeling and other things. But if you are using text for describing something, you probably could use an image more effectively.