In the context of epistemological revisions in psychiatry of our time, it seems worthwhile to support the diversity of psychiatric exercises. From a case of our practice as a psychologist, with adult subjects suffering from infantile psychoses and hospitalized in psychiatric institution, we try to answer these questions: how to help the schizophrenic subject, when he found no compass to guide the world to do with his body, others, or objects? What’s wrong with the subject says “schizophrenic” when talking or even circulate in the world appear to be dangerous? How then the subject does support a world woven by symbolic, and more an institution that supports the common language? Then from our research work on the current treatment of schizophrenia, we attempt to identify the theoretical interest of the “pretenses” use of the subject and its partners, as a space of invention.