A bookcase or bookshelf, is a piece of furniture, almost always with horizontal shelves, used to store books.  A bookcase consists of a unit including two or more shelves which may  not all be used to contain books or other printed materials. Shelves may  be fixed or adjustable to different positions in the case. In rooms  entirely devoted to the storage of books they may be permanently fixed  to the walls and/or floor. Bookcases frequently have doors that should  be closed to protect the books from air pollution, and bookshelves are  open-fronted. These doors are almost always glazed, so as to allow the  spines of the books to be read. Especially valuable books may be kept in  locked cases with wooden or glazed doors. A bookshelf normally stands  on some other piece of furniture such as a desk or chest. Larger books  are more likely to be kept in horizontal piles and very large books flat  on wide shelves.
In Latin and Greek the idea of bookcase is represented by Bibliotheca and Bibliotheke (Greek: βιβλιοθήκη), derivatives of which mean library in many modern languages.


















 
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