This paper examines the role of the imagination in Hume's epistemology. Three specifi c powers of the imagination are identifi ed – the imagistic, conceptual, and productive – as well as three corresponding kinds of fi ctions based on the degree of belief contained in each class of ideas the imagination creates. These are generic fi ctions, real and mere fi ctions, and necessary fi ctions, respectively. Through these manifestations, it is emphasized, Hume presents the imagination both as the positive force behind human creativity and a subversive presence that transforms experience while at once making it possible.