A city structure typically consists of a THEATER, GALLERY, STADIUM, and LIBRARY. A THEATER is a building used for the performance of plays, musicals, operas, and other performances. A GALLERY is a building or room used to display works of art. A STADIUM is an outdoor venue used for sports and other large events. Finally, a LIBRARY is a building or room containing collections of books, periodicals, and other materials for people to read, borrow, or reference.