Being a visual person, I find no shame in judging a book by its cover. If the cover art is uninteresting to me, or outdated, I just assume the book is outdated. I realize that is not completely fair, but I can't help it! I'm sure I miss out on so many great books because of it! I also usually prefer a certain feel to book covers. I love the art on both of these and I realized that they are both really similar. They are both minimalistic, warm and inviting. They also have simple, visually pleasing typography. I think with book covers, it is important to portray simplicity because no one wants to read something complex, even if it is a textbook.