Paul Reyberolle (1926-2005) was a French artist who was largely focused on displaying philosophical and political views though expressive abstract art. He even joined the Communist party in the 50s but left after five years. He went to Paris in 1944 to pursue his painting and his works are profound and full of nature, emotion and energy. His work was greatly admired the the artistic community of post-war Paris and particularly by Jean-Paul Sartre and Michel Foucault. You can visit a museum dedicated to his works in his hometown of Eymoutiers.