The walls of our city have a voice and soul. A discourse of slogans, both public and private, infuses our urban landscape. Sometimes subtle, sometimes intense, in central or unexpected corners of the city, the unknown slogan-writers, graffiti artists and painters of our city bear witness to the history of our times, their political ideology, their complaint, their hope, their love, their anger, their solidarity. They roam the streets, they paint the walls to express their thoughts and invite us to read their ephemeral, dynamic and sensitive slogans.