There’s a very popular book written by Harold Stolovitch and Erica Keeps called
Visuals can help or hurt your presentation. Done well, images can help a speaker be more persuasive, more credible, and more emotive. They can simplify a complex idea, and they can even garner an audible gasp from the audience, as one presenter did simply by showing the difference between a beach in the U.S. and a beach in China. At this point in the presentation, the speaker was a bit dull and rather dry. When the slide advanced to the second image (above right), the audience responded exactly as he had intended. Everyone was focused and listening to his key message.
4. Do you need to edit? And edit some more? Let’s not forget the infamous “spaghetti slide” used by the U.S. military back in 2009 to explain why the war in Afghanistan was so expensive and protracted. The story goes that after seeing the slide, General McChrystal said, “When we understand that slide, we’ll win the war.”