Theatre nerds spend a lot of time obsessing over casting choices: who's going to play this classic role in the latest revival of a Broadway musical? How might an unconventional casting choice up-end our assumptions about who a character is and what they look like? Dr. Amy Cook of Stony Brook University looks at what's going on in our heads when we ask these questions. Her forthcoming book, Building Character: The Art and Science of Casting, examines the cognitive processes that allow us to understand what's happening in, say, an all-female version of The Taming of the Shrew, or the casting choices behind a modern hit like Hamilton.