Theatre-in-the-round, also known as arena theatre or central staging, is a theatrical stage configuration in which the audience surrounds the performance area on all sides.
Historically rooted in ancient Greece and Rome performance practices, the format was reintroduced and popularized in the mid-20th century through pioneering venues like the Glenn Hughes Penthouse Theatre in Seattle, Washington. It opened on May 19, 1940, with a production of Spring Dance, a comedy by playwright Philip Barry. The 160-seat theatre is located on the campus of the University of Washington and is listed on the National Register of Historic Places.