What is happening when a place in the world has life? And what is happening when it does not? In Book 1 of this four-volume work, Alexander describes a scientific view of the world in which all space-matter has perceptible degrees of life, and sets this understanding of living structure as an intellectual basis for a new architecture. He identifies fifteen geometric properties which tend to accompany the presence of life in nature, and also in the buildings and cities we make. These properties are seen over and over in nature, and in cities and streets of the past, but have all but disappeared in the deadly developments and buildings of the last one hundred years. The book shows that living structure depends on features which make a close connection with the human self, and that only living structure has the capacity to support human well-being. The other three volumes of The Nature of Order continue this thesis with three complementary views giving a masterful prescription for the processes which allow us to generate living structure in the world. They show us what such a world must gradually come to look like, and describe the modified cosmology in which "life" as an essential quality, together with our inner connection to the world around us-towns, streets, buildings, and artifacts-are central to a proper understanding of the scientific nature of the universe.