On what there really is. Empirical Realism between Physics and Psychology

An opposition between two conceptions of our knowledge of the external world is outlined. On the one hand physicists, like Dirac and Heisenberg, maintain that only what Physics considers real is actually real. On the other hand, psychologists, like Metzger, Kanizsa and Bozzi, believe that every sensible content is real, so that the psychology of perception would be the only real physics. We attempt to sketch a critical perspective, based on a reasonable criterion, in order to prospect a different solution to this question.