Exploration.

Then there are the fully intentional pleasures, which, although in some way tied up with sensory or perceptual experience, are modes of exploration of the world. Aesthetic pleasures are like this. Aesthetic pleasures are contemplative - they involve studying an object outside of the self, to which one is giving something (namely, attention and all that flows from it), and not taking, as in the pleasure that comes from drugs and drinks. Hence such pleasures are not addictive - there is no pathway to reward that can be short-circuited here, and a serotonin injection is not a cheap way of obtaining the experience of Parsifal or The Merchant of Venice.

Sir Roger Scruton, from On Human Nature