Book excerpt: Revised to incorporate the changes in opinions and attitudes since its first publication, the second edition of 'Places of the Soul' has brought Christopher Day's classic text into the 21st century. This new edition of the seminal text reminds us that true sustainable design does not simply mean energy efficient building. Sustainable buildings must provide for the 'soul'. For Christopher Day architecture is not just about a building's appearance, but how the building is experienced. 'Places of the Soul' presents buildings as environment, intrinsic to their surroundings, and offers design principles that will open the eyes of the architecture student and professional alike, presenting ideas quite different to the orthodoxy of modern architectural education. Christopher Day's experience as an architect, self-builder, professor and sculptor have all added to the development of his ideas that encompass issues of economic and social sustainability, commercial pressures and consensus design. This book presents these ideas and outlines universal principles that will be of interest and value to architects, builders, planners and developers alike.