Why does Gilles Deleuze write about the cinema to address specific philosophical problems? Deleuze turns to the cinema precisely because its formal resources enable it to 'think' the relation between movement and duration in ways that philosophy cannot. Allan James Thomas unpacks the nature of the philosophical problems that Deleuze turns to the cinema to resolve and shows how resources of the cinema enable him to do so where philosophy alone cannot. He offers new insights into the conceptual underpinnings both of the Cinema books themselves and of the trajectory of Deleuzian philosophy.