I introduce and explicate a new functionalist account of art, namely that something is an artwork iff the fulfillment of its function by a subject requires that the subject aesthetically engage it. This is the Aesthetic Engagement Theory of art. I show how the Aesthetic Engagement Theory outperforms salient rival theories in terms of extensional adequacy, non-arbitrariness, and ability to account for the distinctive value of art. I also give an account of what it is to aesthetically engage a work (...) that relies on our agential capacity to treat an object as having non-instrumental value, even while the ultimate purpose for our engaging the object is to get something from it. (shrink)