I read Plato and the Platypus by Umberto Eco, which I found brilliant and was sucked into buying this book thinking it was about the same problem of categories. But Philosophy this is not, or if it is, it is not deep enough to give satisfaction. This is like a brief drink in an airplane lounge with someone funny, smart, witty, but not too funny. So I would give it my lowest rating: 4 stars (as an author I can't give below that --I just would not review). Would I buy it again? Perhaps, but only for a plane ride. It left me very very hungry for both jokes and philosophy.