Great topic! This is something I have thought about here and there throughout the whole class. I also immediately though of how it seems that the movie posters are photos and the books are more likely illustrations. This would be interesting to research, or maybe it's been done. It must be related to how when you're designing a book cover, it's kind of abstract and in your imagination, and different readers would have different visions of the characters. When you have a movie, you have the very specific and very important real-life actors. (Sometimes readers/viewers disagree with those choices.) Then of course you have books that are re-published after a movie and their cover is the movie poster. It's fascinating to see these designs side by side.