The printed materials that show the layout and part of the contents of books and periodicals used to be printed by imitating the original books or lithographs, but now most of them are photocopied, some are used as inserts, and some are collected into volumes. "Book shadow" refers not only to the cover pattern of a book, but also to the inside page and back cover. Generally speaking, the function of book shadow is to show and introduce the style of a book to readers, especially for the display of rare books of ancient books. The book Shadow is published now, mainly for the study of edition bibliography. The forms of ancient books, such as lines, fonts, margins, ink colors, Tibetan seals, inscriptions, etc. If it is described in words and detailed, it is still an armchair strategist. You'd better take a look with your own eyes. As most friends who are not interested in edition bibliography, flipping through books and videos is also an appreciation.
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