How much ought you to know about an artwork before seeing it to get the maximum appreciation? “There are compelling arguments for appreciating an artwork on its own terms. Some people refuse to read movie reviews for fear that not only surprise endings but also subtle textural details will be revealed and spoil an otherwise fresh encounter. If they want to dig deeper into a film or an opera or a dance, they wait until they’ve seen it, then double back and do their research. But the sedimentary texture of knowledge, the layerings of appreciation, can provide pleasure on a first encounter, too.”