In September 2008, an International Symposium organized by the "Ambiances Architecturales et Urbaines" laboratory in Grenoble, brought together near to 300 architects, planners, landscapers, environmental designer, artists, psychologists, philosophers and sociologists. They have suggested answers, talked about and compared their experience, and raised questions prompted by current practices in the built developed space. Resulting from the Symposium, this book aims to cross over various ways of addressing the concrete nature and the creating atmosphere though there main questions. What makes an atmosphere ? How is an atmosphere or an ambiance created ? How does one make an ambiance in an architectural or town planning project ?