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Home to an average of 416 classes a day, the College of Arts & Sciences—better known as CAS—is easily the busiest classroom building on campus. Each day, nearly 9,000 students walk through its arched doorways, taking courses in subjects from earth sciences and chemistry to modern languages and art history.

But once classes are done for the day and dusk falls, something magical happens inside the sprawling Gothic building. Classrooms, hallways, and stairwells are transformed into a vibrant rehearsal space for dance troupes, comedy acts, theater groups—even a barbershop quartet.

“CAS has a completely different life to it at night,” says Ian Blau (COM’15), whose group, Theater for Everyone, practices there.