Janna Levin is a theoretical cosmologist and professor of astronomy and physics at Barnard College in New York City, specializing in the study of black holes. A Guggenheim Fellow, she’s authored several books on the topics of space, mathematics, and the impassioned people that study them; her latest book, “Black Hole Survival Guide,” allows readers to imagine an encounter with a black hole. In the final episode of this season of The Open Ears Project, Janna Levin uses the music of Mozart to venture into the world of perfect circles, spacetime, and the drive to reach a platonic ideal. She muses on the benefits of limitations and rules, and how they have led to some of the most revolutionary scientific discoveries and works of art, from Einstein’s theory of relativity to Mozart’s unfinished Requiem Mass. This recording of Mozart’s Requiem was provided courtesy of the New York Philharmonic.