This book is about the shape of things. What limits the height of a tree, why is a large ship or office building more efficient than a small one, what is the similarity between a human rib cage and an aeroplane, or a bison and a cantilevered bridge? How might we plan for things to improve as they are used instead of wearing out? The author has chosen eight criteria that constitute the major influences in three-dimensional form. These criteria comprise the eight chapters of the book; each looks at form from entirely different viewpoints. The products of both nature and man are examined and compared. The facts and information were gathered from many sources and the result is an invaluable work for students, designers, architects, planners, and an informed introduction to a fascinating subject for laymen.