One of the mounting styles of China's calligraphy and painting. Because the painting is not big, it is also called "sketch", also known as Ye Shu and Ye Shu. It consists of a folded cardboard, which can be turned left and right or up and down. There are three styles of album pages, one is horizontal painting heart, which is framed and turned up and down, called "pushing tent style"; One is the vertical painting of the heart, which is folded in half from left to right, called "butterfly style"; The other is called "warp folding" (warp folding), and the smaller vertical bar is called "passbook"; Some of them are packed in a single piece, which is called "bulk".