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With Freud and Lacan the question of psychosis has always served to revive thinking, and this is not without consequences for psycho­analysis. However, psychosis demonstrates an antinomy between thinking and reality. With Freud, psychosis is used as an introduction to thinking about the development of the Ego (narcissism), to be understood not as an imaginary function but as the development of the structure, forever redone and rethought (in the course of analysis in general). Lacan uses psychosis as an introduction to the necessity of thinking on the question of the subject, which he makes explicit with Moebian and Borromean topology. This rallying of thinking about psychosis brings all at once into question reality, perception, the subject, whilst simultaneously opening the field strictly psychoanalytic of psychic reality, hallucinations and objet a.