Imagination, Modal Knowledge, and Modal Understanding

Recent work on the imagination has stressed the epistemic role of imaginative experiences, notably in justifying modal beliefs. An immediate problem with this is that modal beliefs appear to admit of justification through the mere exercise of rational capacities. For instance, mastery of the concepts of pig, flying, and possibility should suffice to form a justified belief that flying pigs are possible, regardless of whether one imagines a flying pig. In this paper, I consider three ways to defend the epistemic role of imagination in the face of this problem. One is that modal beliefs simply admit of justification by two separate sources: rational capacities and imaginative experience. Another is that while beliefs about logical or conceptual modality can be justified entirely by rational capacities, beliefs about metaphysical modality require imaginative experiences. The third, which I defend, is that imagination is relevant in the first instance not to modal knowledge but to modal understanding: even where imaginative experience is unnecessary for the justification of modal beliefs, it is indispensable for directly grasping certain modal facts