In ideal Topography for a characterized aggression, Rachid Boudjedra represents an illiterate emigrant lost in the maze of the Parisian subway. The reader follows the errance of this emigrant in search of his drop point writing on a bit of paper. At the end of long odyssée, it is found mortally attacked by a group of racists in exit of the subway. Our analysis based on works of Gilbert Durand, Umberto Eco, Deleuze and Guattari, Ethnocritic and urban semiotics, wants to be a description of this allegory of the modern world represented by the Parisian subway. An allegory that the writing that us of labyrinthian practised by the author also represents at the scriptural level.