An interlude of false innocence has passed. Today, as we enter the post-photographic era, we must face once again the ineradicable fragility of our ontological distinctions between the imaginary and the real, and the tragic elusiveness of the Cartesian dream. We have indeed learnt to fix the shadows, but not to secure their meanings or to stabilize their truth values; they still flicker on the walls of Plato's cave.