Here are entered works on books that are produced by artists and intended as visual art objects. Actual specimens of such books are entered under [Artists' books--Specimens,] a form heading assigned without geographic subdivision. Works on books illustrated with original prints by well known artists and published in limited editions are entered under [Artists' illustrated books.] Works on existing books whose pages have been altered by paint, collage, or other media are entered under [Altered books.] Works on sculpture that mimics the format or structure of a book are entered under [Book objects.] Works on custom bindings of books, irrespective of contents, are entered under [Fine bindings.]