In response to Bergson's claim that modern science has not found its metaphysics, Deleuze remarked that it was this metaphysics that particularly interested him. In recent years, as the complexities of Deleuze's work have been critically evaluated, interest has grown in the important part that science and a corresponding metaphysics plays in this work, including the publications that were co-authored with Félix Guattari. Necessarily, much of this critical work has explored the precise nature of Deleuze's expressive materialism. It has been suggested, by Manuel DeLanda for example, that Deleuze's realist ontology has much in common with an intensive science that concentrates on the divergent processes that underpin the extensive world of finished products that we see around us. John Protevi and Mark Bonta have suggested that, in the same way that Kant's Critiques corresponded to a world of Euclidean space, Aristotelian time, and Newtonian physics, so Deleuze's philosophy helps to make sense of the wo