The figure implied and controlled by the connection of the stroke edges on the left and right sides of each word in a line has an important influence on the style of the work. The gently changing outline outside the line can show the quiet, dignified, moderate and peaceful style of the works, such as Preface to the Sacred Religion by Wang Xizhi, Preface to Zhao Meng's Poems by Lanting and Shu Sutie by Mi Fei. The undulating outline of the lines can show the strange, ups and downs, turbulent and passionate style of the works, such as Letters from the Two Kings, Weeds in Plain Deficiency, Valley, Grass in Shan Zhi Mountain and Grass in Wang Duo and Fu Shan in Ming and Qing Dynasties; There is also a style between the two, which can also be seen from the classics of past dynasties.
In addition, more importantly, the echo of the outer contours of two adjacent lines forms a vivid spatial relationship in calligraphy works.
Therefore, in the process of approaching ancient times, we should be keenly aware of the sensitivity to the side, and pay attention to the change and echo relationship (opening and closing) between the sides of various lines, which is of great guiding significance to the study of popular spirit and even the handling of rules and regulations.