A few days ago author Maureen Johnson tweeted, "I do wish I had a dime for every email I get that says, 'Please put a non-girly cover on your book so I can read it. - signed, A Guy,'" and the Coverflip challenge was born. Johnson asked her followers to "take a well-known book, then to imagine the author of that book was of the opposite gender, or was genderqueer, and imagine what that cover might look like." Some of the resulting cover makeovers are funny (like this reimagining of Shutter Island as a beachy "novel of self-discovery"), some are pretty ridiculous, but they all say a hell of a lot about how books are very clearly gendered, and how publishers market male and female authors in drastically different ways. Want proof? Click through to check out a few more Coverflips...