Butterfly clothes in the shape of ancient books in China

Because the folded part of the cyclone blade is easy to break and become loose pages, it is not convenient to arrange. So later, it was changed into a single page, and the side with words was folded up, and the folded seams of a stack of single pages were glued to a piece of paper, and the outside was wrapped with hard paper to form a book. After opening, the page is symmetrical, like a butterfly spreading its wings, hence the name. Also known as "butterfly costume", short for "butterfly costume" or "costume". The most popular butterfly suit in Song Dynasty was used in Yuan Dynasty and eliminated in Ming Dynasty. In the butterfly suit, the hard paper wrapped on the front and back of the book is called the book cover, and the long and narrow note with the title and book number on the left side of the front of the book cover is called the bookmark. The top of the book is called the head of the book, the bottom of the book is called the root of the book, one side of the book cover (that is, the left side) is called the book mouth, and the other side is called the back or spine of the book.