I've just had a brief introduction to the 1940-book by Sartre called L'Imaginaire. It became very clear that Sartre ends up with several problems in this book, which Castoriadis's concept of the (radical and social) imaginary adresses, and solves very well. I believe that Castoriadis must have worked specifically with - and up against - this thought of Sartre's in his own main work, The Imaginary Institution of Society. However, I have never heard mention of any connections between these works. Does anyone know if there has been written papers or articles that investigate the connections between them?