How are ancient books bound?

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The binding form of ancient books:

Simple introduction-reel loading-warp folding loading-butterfly loading-package loading-line loading?

The above has evolved in historical order.

The simple strategy is bamboo slips, needless to say, scrolls, which are the memorials that the emperor unfolded when we watched the Qing Palace drama. Butterfly dress is the predecessor of Bao Bei dress, that is, one side of a whole piece of paper is printed with words and the other side is blank. The whole book is a lot of such papers piled together, stuck together from the middle, that is, the spine. The disadvantage is that when reading, one page has words and the next page has no words. Bao Beizhuang added a cover on this basis. Thread binding is the highest form of book binding in ancient times. It is not easy to damage the pages by sewing the paper together at the spine with thread.