In some cases, the questions that preoccupy philosophers are identical to the questions of psychologists and so are amenable to straightforward scientific research. Sometimes, though, the philosophical questions aren’t empirical—nobody is going to do an experiment to answer the question “What is art?”—but, still, one can study an interesting near neighbor, in the style of what’s sometimes known as “experimental philosophy.” For instance, you can look at what people (art experts, laypeople, four-year-olds) think is art.