This book explores the issues of transformation phenomena of the urban dimension (regionalization processes) that traditional scientific literature fails to describe appropriately. So far, scholars have adopted a widespread dominant perspective that proved unable to grasp the essence of post-modern complexities that urban spaces imply. The book provides a taxonomy, in order to describe the rules of these new and peculiar cities, by using the living dimension as a device for the epistemological breaking down of traditional socio-spatial analyses. After a thorough theoretical introduction, it describes two Sicilian case studies that prove particularly relevant to the construction of a new, alternative urban regionalization theory. These two