This famous illustration of how bereft of all real power and meaning Powerpoint presentations necessarily are is by Peter Norvig (www.norvig.com): Gettysburg
Just click the Gettysburg link above to see one of the great moments in all human history reduced to marketing slides. It is both hilarious and deeply troubling. Once you’ve seen it, you realize how almost all political speeches today can be easily transferred to Powerpoint without losing any of their original depth.
The Historic Present 