A bookend is an object tall, sturdy, and heavy enough that is placed at either end of a row of upright books to support or buttress them. Heavy bookends—made of wood, bronze, marble, and even large geodes—have been used in libraries, stores, and homes for centuries; the simple sheetmetal bookend uses the weight of the books standing on its foot to clamp the bookend's tall brace against the last book's back; in libraries, simple metal brackets are often used to support the end of a row of books. Elaborate and decorative bookends are common as elements in home decor.