In ancient times, what were the names of books folded into a stack?

Album (mostly calligraphy and painting works)

Folding clothes are also called Van Gogh's clothes and folding clothes. Fold the book according to a certain width and add the cover to make it a booklet that can be read at any time. This form of binding was used to print Buddhist scriptures and collect Taoist scriptures in past dynasties. This form is often used in ancient memorials and letters.

Note: Book cover is the front cover and back cover of a book, also called book cover and writing style. There are two kinds of book clothes: cloth and paper. The most common is made of chestnut tassel paper and cyan historical paper. Cloth and cotton silk are mostly used in rare books of ancient books. In the Ming and Qing dynasties, the Forbidden City books were often dressed in yellow silk to show their dignity. The book cover is usually engraved with the title, or written directly on the cover, or bookmarked.