Hume Studies

If anything about Hume’s philosophy can be characterized as widely accepted, it is that the imagination is front and center in Hume’s account of the mind. The aim of Timothy Costelloe’s book is to fully develop the observation, that the imagination, as Hume understands it, is “the canvas of the mind.” Costelloe amply demonstrates that the imagination is a broad canvas, ranging from Hume’s epistemology and metaphysics, to his aesthetics, moral and political philosophy, history, philosophy of religion, and his general conception of philosophy itself. Seven substantial chapters cover these areas, and show how Hume takes the imagination to play a pivotal role in each.

One of the many strengths of this book is that Costelloe responsibly mines the secondary literature, carefully explaining the interpretations he seconds and those he finds wanting. The attention to the relevant secondary literature is apparent from the start, where Costelloe laments the surprising dearth of book-length treatments of Hume on the imagination, but helpfully highlights both the lesser known Hume-centric monographs on the imagination by Furlong and Wilbanks, as well as more widely read interpretations.

The introductory chapter makes important distinctions and introduces some main concepts. Hume differentiates the imagination’s “combinatory power” from its “creative power.” While the uninhibited ability to concatenate ideas might also be seen as a creative act, Costelloe sees the creative power where the imagination [End Page 173] “generates a class of ideas—‘fictions’ of a certain sort—independent of experience and according to its own inner logic” (21). This characterization makes sense when viewing the imagination’s function as directed towards a goal, such as achieving coherence or creating an aesthetically pleasing effect. Costelloe suggests that achieving an aesthetically pleasing effect is an element in any exercise of the imagination’s creative power. The imagination creates easy transitions among ideas where there were none, where doing so is pleasurable, or aided by the passions.

Costelloe introduces his account of Hume’s fictions as errors of the imagination whereby ideas are formed in a manner different from the standard derivation from antecedent impressions. He insists, helpfully, that fictions are not illusions, but rather errors of a different kind. Though both involve error, fictions, unlike illusions, are not described in terms of jest or irony (30).

Though he acknowledges that Hume does not describe any fictions as “artificial,” Costelloe finds it helpful to draw a distinction between natural and artificial fictions. Natural fictions are generated without reflection. Artificial fictions, such as those created by poets and philosophers, issue from “the voluntary act of imagination” (31). Costelloe holds that artificial fictions “are rarely taken to refer to objects with real existence and that any professed belief is really a matter of people being persuaded of something and taking the ideas in question as having real referents, thus only lending themselves to their existence for one reason or another” (31). This is a bit unclear. Certainly, poetic fictions are voluntary creations not intended to refer to real objects. But substance, and the double existence of ideas and external objects, as philosophical fictions, surely both involve belief and the corresponding existential commitments on the part of the philosophers who are committed to them. It is also difficult to see the purported contrast between belief and taking ideas to have real referents.

Chapter 2, on metaphysics, is the longest chapter in the book, and it addresses the fictions of the imagination in Hume’s account of space and time, continued and distinct existence, liberty and necessity, and personal identity. Costelloe is sensitive to the worry that classifying Hume’s subject in Book 1 of the Treatise as metaphysics may appear to be slighting the central epistemological concerns and failing to appreciate Hume’s nascent cognitive psychology. Such worries fall away as Costelloe explores the roles that the imagination plays in the formation of our conception of duration without change, and the identity...