Michel Tournier had a Sartrean youth. But his radicalization of existentialism pushed him to return to a Cartesian cogito. He thus compromised the transparency of our relation to things that phenomenology intended to guarantee. In this respect, the consciousness without thickness put forward by his friend Gilles Deleuze seems more satisfactory. However, the latter was particularly interested in the movements of subjectivation, belatedly following the path that Tournier had opened before him.