Three important, closely linked concepts stand at the center of the thought of Cornelius Castoriadis (1922 1997): the imaginary, creation, and autonomy. They refer to the wide spectrum of meanings through which a society develops symbolic forms and institutional structures in order to express its identity. The radical left-wing group Socialisme ou Barbarie, founded by Castoriadis in 1948 together with Claude Lefort, influenced numerous labor movements throughout Europe. For his notes on topics in philosophy, economic science, politics, mathematics, and psychoanalysis, excerpts of which are reproduced here, Castoriadis never used a notebook, but rather any material within his reach, whether the backs of ration cards or the empty lines in a conference program. sakriti opis