"The Perfect Shape" by Øyvind Hammer is a captivating specialized book that explores the fascinating world of spirals. It uniquely combines various disciplines such as art, nature, science, and mathematics. The structure of the book reflects the spiral theme by presenting seemingly separate chapters that revolve around a common core. The author places a strong emphasis on mathematical and scientific accuracy, which sets this book apart from other works on the subject. The topics covered range from the mathematical properties of spirals to the anatomy of the human hand, as well as historical aspects of mathematics and art. This book is not only informative but also entertaining and thought-provoking, as it highlights the connections between different fields of knowledge.