[Polkinghorne] offers much insight in this thoroughly delightful little book into the nature of the conceptual problems at the heart of the twentieth century’s most successful theory… . I wholeheartedly recommend The Quantum World… .–Tony Hey, New Scientist A delightful book, written at a popular level but without any misleading over-simplification .–Roger Penrose, The Times Higher Education Supplement The author’s life as well as his oeuvre, especially this lovely little book, bear testimony to the fact that … science and nature can coexist in harmonious complementarity .–Abraham Pais, Nature