The graffiti birth is initially recognized for its illegal nature and its “disrespectful push”. However, Street Art today is full of different meanings, that are no more necessary connected to the inner message, but almost linked to the medium, the style and the relationship with the chosen location. Also the illegal nature couldn’t be considered as a fundamental prerogative of contemporary graffiti. Considering the hybrid and multiple character of contemporary Street Art, in terms of register, execution methods, references and communicative intent, it is becoming increasingly important to distinguish the works of writers, be they legal, illegal, lasting or temporary, from the practices of simple vandalism, going to analyse the canons, even...