From this point of view, it does not seem that the real and the imaginary form a pertinent distinction. A real voyage, by itself, lacks the force necessary to be reflected in the imagination; the imaginary voyage, by itself, does not have the force, as Proust says, to be verified in the real. This is why the imaginary and the real must be, rather, like two juxtaposable or superimposable parts of a single trajectory, two faces that ceaselessly interchange with one another, a mobile mirror.