This remarkable book has endured as a true masterpiece of mathematical exposition. There are few mathematics books that are still so widely read and continue to have so much to offereven after more than half a century has passed! The book is overflowing with mathematical ideas, which are always explained clearly and elegantly, and above all, with penetrating insight. It is a joy to read, both for beginners and experienced mathematicians. "Hilbert and CohnVossen" is full of interesting facts, many of which you wish you had known before. It's also likely that you have heard those facts before, but surely wondered where they could be found. The book begins with examples of the simplest curves and surfaces, including thread constructions of certain quadrics and other surfaces. The chapter on regular systems of points leads to the crystallographic groups and the regular polyhedra in \(\mathbb{R}^3\). In this chapter, they also discuss plane lattices. By considering unit lattices, and throwing in a small amount of number theory when necessary, they effortlessly derive Leibniz's series: \(\pi/4 = 1  1/3 + 1/5  1/7 +  \ldots\). In the section on lattices in three and more dimensions, the authors consider spherepacking problems, including the famous Kepler problem. One of the most remarkable chapters is "Projective Configurations". In a short introductory section, Hilbert and CohnVossen give perhaps the most concise and lucid description of why a general geometer would care about projective geometry and why such an ostensibly plain setup is truly rich in structure and ideas. Here, we see regular polyhedra again, from a different perspective. One of the high points of the chapter is the discussion of Schlafli's DoubleSix, which leads to the description of the 27 lines on the general smooth cubic surface. As is true throughout the book, the magnificent drawings in this chapter immeasurably help the reader. A particularly intriguing section in the chapter on differential geometry is Eleven Properties of the Sphere. Which eleven properties of such a ubiquitous mathematical object caught their discerning eye and why? Many mathematicians are familiar with the plaster models of surfaces found in many mathematics departments. The book includes pictures of some of the models that are found in the Göttingen collection. Furthermore, the mysterious lines that mark these surfaces are finally explained! The chapter on kinematics includes a nice discussion of linkages and the geometry of configurations of points and rods that are connected and, perhaps, constrained in some way. This topic in geometry has become increasingly important in recent times, especially in applications to robotics. This is another example of a simple situation that leads to a rich geometry. It would be hard to overestimate the continuing influence HilbertCohnVossen's book has had on mathematicians of this century. It surely belongs in the "pantheon" of great mathematics books. Readership Advanced undergraduates, graduate students and research mathematicians; mathematical historians. Reviews "[This] superb introduction to modern geometry was coauthored by David Hilbert, one of the greatest mathematicians of the 20th century."  Steven Strogatz, Cornell University "A fascinating tour of the 20th century mathematical zoo ... Anyone who would like to see proof of the fact that a sphere with a hole can always be bent (no matter how small the hole), learn the theorems about Klein's bottlea bottle with no edges, no inside, and no outsideand meet other strange creatures of modern geometry, will be delighted with Hilbert and CohnVossen's book."  Scientific American "Should provide stimulus and inspiration to every student and teacher of geometry."  Nature "Students, particularly, would benefit very much by reading this book ... they will experience the sensation of being taken into the friendly confidence of a great mathematician and being shown the real significance of things."  Science Progress "A person with a minimum of formal training can follow the reasoning ... an important [book]."  The Mathematics Teacher Table of Contents  The simplest curves and surfaces
 Regular systems of points
 Projective configurations
 Differential geometry
 Kinematics
 Topology
 Index
