Our mothers told us not to judge a book by its cover*. But when they're wearing what RC described, it's not because they wanted us to engage in discussion of the nature of good and evil.



* Did you know that phrase is actually 100% wrong? Once upon a time it was common to print books with plain card stock covers. Unscrupulous dealers would take remaindered works and re-cover them with the titles of more successful offerings. So you literally couldn't judge a book by its cover, because that might not have been what was inside.

In today's market, they spend significant time and expense producing covers explicitly so that you can judge the book. And remaindered books have the covers ripped off to prevent fraud. And modern bookbinding would make a re-cover job very obvious anyway.