I loved the title, so picked this book up at Caltech's library, but fastread it in a hurry when another Caltech patron recalled it, so take this review with a huge grain of salt. In brief, it did not impress me. Spent several pages trying to explain why the hypothesis that emeralds are green is preferred over the hypothesis that they are green until next year, when they will all turn blue. Overall, took geometry too literally, I think. And was lacking in deep insights. But it's bravely tackling the right questions.