Spacetime, geometry and consciousness provide Roger Penrose with subjects ranging from popular science to highly technical mathematics. The Emperor’s New Mind argues that human understanding cannot be fully explained by ordinary computation, linking artificial intelligence with Gödel’s theorem and quantum physics. The Road to Reality is a much larger and more technical guide to the mathematics underlying modern physical theories, while Cycles of Time presents his conformal cyclic cosmology. Penrose also developed the geometric tilings that bear his name and has written with Stephen Hawking on cosmological questions. His books range from accessible conceptual argument to demanding mathematics, so difficulty varies sharply by title. The strongest neighbouring categories are relativity, cosmology, mathematical physics and philosophy of mind. Read more Less