The book intends to analyze, deepen and recognize two avant-garde artistic movements of the contemporary through a multi-disciplinary look. First the Writing and then the Street Art have always fed on every corner of the real, indiscriminately and free from any "formative debt". Today, more than ever, this investment is visible in architecture, urban planning, semiotics, sociology, anthropology and the art scene. The difficulty of structuring a critical unanimous profile on the part of scholars in the sector lies mainly in the multiplicity and vivacity with which the two movements have drawn and anticipated collective styles, environments, attitudes and sensibilities. With over 40 years of history and street behind it, Writing and Street Art have had the merit of reproducing and criticizing the entire global system of visual communication.