You’re a rare writer if you don’t occasionally suspect yourself of plagiarism, of unconsciously stealing phrases from your favorite author or appropriating plot points from books you've read as a child. Or maybe, you're haunted by a sneaking suspicion that everything is something you’ve read before. But maybe that’s not a bad thing. The books below not only acknowledge the artistic impulse to use borrowed material, they embrace it as the cultural phenomenon it’s become. The digital revolution means that an audience can, for the first time, respond rapidly, actively, and en masse to whatever