Great post. I think those of us who teach presentation skills and presentation design often proclaim the “less-is-more” sentiment without any clarifying details. I especially agree with your point about a lower boundary. Choosing the design of a slide is not as easy as just grabbing a semi-related image. Presenters must challenge themselves to ensure that their choice of imagery, text, and design does enough to compliment the information coming out of the speaker’s mouth. If a slide is too disconnected the audience will certainly be confused, thus resulting in lower recall.