In the existing literature regarding Gilles Deleuze's doctoral thesis, Spinoza: expressionism in philosophy and Difference and repetition, there is a void concerning the relation between the two. This thesis aims at not only bringing to light the conceptual architectures of both texts but also at presenting novel connections between the two: Deleuze's ontology may be reconstructed in light of his interests in Spinoza's finite modes and a contemporary renewal of the problem of individuation.