Abstract: According to Deleuze, the importance of the Baroque is not the history of art, but what counts is to force us to think about "the possibility of the fold to infinity". The fold, as "point of view", is the distinct expression of the universe, while each fold is inseparable from becoming. The Baroque has no essence. It is just a mannerism pushed to infinity. Through the Monad of Leibniz, Deleuze creates the concept of the fold. Between the Monad and the universe, there is a non-relative who built the "milieu" or "common Limit". Through the conception of the fold, Deleuze answers the critical question of "what is thought".

Key words: Gilles Deleuze, Baroque, fold, monad, Leibniz