She writes a cracking yarn and has an intuitive understanding of a child's emotional world. On this level the Harry Potter books have great integrity. True, Rowling has picked like a magpie through the treasury of children's stories. Her Every Flavor Beans, which offer all sorts of surprises to the taste buds, echo products from Willie Wonka and the Chocolate Factory . But in literature, little is truly original.
Most stories are derivative in some way.
Rowling has been criticised for copying Roald Dahl in her sketching of Harry as an orphan child abused by nasty relatives, but Dahl's James and the Giant Peach mimicked an even earlier abused-orphan story, Cinderella . James Joyce drew on the myth of Ulysses to produce his modern classic of the same name, and academics build whole careers detecting the allusions buried in it. Kids could play a similar game with the post-modern parodies in Harry Potter books. When they grow up and study media they'll be told it's called intertextuality. He smiled and popped the golden brown bean into his mouth.