The source of folded clothes

Stein's "Guo Huang takes the secretary" contains: "There is another Buddhist scripture, which is poorly printed, but it is quite obvious that it has changed from the old one to the new one. Books are not paper books, but folded books, and the first part of this form is also covered. ..... Fold the book, connect the long pieces, fold it, and finally glue the other end firmly. So after it is unfolded, it is very similar to a modern book. " It can be seen that the folding Tang Dynasty has appeared. It is characterized by single-sided writing and convenient collection and exhibition.