Paintings are usually paintings of things: a room in a palace, a princess, a dog. But what would it be to paint not those things, but the experience of seeing those things? Las Meninas is sufficiently sophisticated and masterfully executed to help us explore this question. Of course, there are many kinds of paintings: some abstract, some conceptual, some with more traditional subjects. Let us start with a focus on naturalistically depictive paintings: paintings that aim to cause an experience in the viewer that is similar to the experience the viewer (or someone else) might have were they to see, in a way not mediated by paint, the subject of the painting. Of course, many or even most paintings do not strictly adhere to this aim; indeed, th...