A private collection is a privately owned collection of works (usually artworks) or valuable items. In a museum or art gallery context, the term signifies that a certain work is not owned by that institution, but is on loan from an individual or organization, either for temporary exhibition or for the long term. This source is usually an art collector, although it could also be a school, church, bank, or some other company or organization. By contrast, collectors of books, even if they collect for aesthetic reasons (fine bookbindings or illuminated manuscripts for example), are called bibliophiles, and their collections are typically referred to as libraries.