Trompe-l’oeil... real or simulated The American painter Edward Hopper (1882 - 1962) brings up the space of his characters in a game of light and shadow against the wall. The facade can be an illusion of depth with the same atmospheric game (light and shadow) arranging the corner where a graffiti may apear... The facade is not a surface, it is a space for the urban expression (the graffiti artist appears)... This proposal wonders: Can “AluDesing” technology allow the urban expressions, which may then appear over the designer default image? Let the city tell it on the facade... Trompe l'oeil is a French expression for 'deceive the eye'.