In art, the highest place has traditionally been given to paintings of people. There’s something to this tradition, and not just because pictures of faces press buttons in our brains that other pictures don’t. We are so good at looking at faces that we force anyone who draws them to work hard to satisfy us. If you draw a tree and you change the angle of a branch five degrees, no one will know. When you change the angle of someone’s eye five degrees, people notice.