Apparently, there are (only?) 12 kinds of ads in the world.
That is, according to Donald Gunn, once a creative director for the advertising agency Leo Burnett.
An excerpt from the article in Slate:
“Though his position implied expertise, Gunn felt he was often just throwing darts—relying on inspiration and luck (instead of proven formulas) to make great ads. So, he decided to inject some analytical rigor into the process: He took a yearlong sabbatical, studied the best TV ads he could find, and looked for elemental patterns.
After much research, Gunn determined that nearly all good ads fall into one of 12 categories—or “master formats,” in his words. At last year’s Clio Awards, I saw Gunn give a lecture about these formats (using ads mostly from the ’70s and ’80s as examples), and I was fascinated by his theory. I soon found myself categorizing every ad I saw on TV. It was a revelation: The curtain had been pulled back on all those sly sales tactics at the heart of persuasive advertising.”