This book is the result of research carried out at the Department of Architecture and Industrial Design of the University of Campania ‘Luigi Vanvitelli’ and thanks to funds from the PON Green and Innovation project. The aim of this work was the desire to investigate a new theory of reuse at a time when space is corrupted by traces of the recent past resulting from speculation and ‘easy building’. The paradigm of architecture’s function is changing and the project must be in dialogue with the possibility of architecture having many more lives than what it was imagined for, perhaps returning to being what it has always been, an organism ready to be everything and composed of layers of time, just as the history of architecture has taught us by building on the built without fear.