Controversy sells big time - and if you publish a book that in the reviews is called "so weird that it's sort of irresistible" - then you're doomed to go down the road of success. That's what happened to a New Zealand author Burton Silver and illustrator Heather Busch, after the release of their comedy book "Why Paint Cats: The Ethics of Feline Aesthetics", a collection of bizarrely colored portraits of cats.