The so-called center pen means that when painting and calligraphy, the nib should always be perpendicular to the paper surface, and the nib should always be in the center of the line, just like Cai Yong said, "Make the nib move in stippling".
On rice paper, the width of ink penetration to both sides is the same, so the strokes look very three-dimensional. In the light, the colors of the strokes are the same, and there will be no feeling that some places are light and some places are strong. The lines are thick and concise, with the feeling of penetrating the back of the paper. This is a high quality line.
If you use oblique, for example, to write a horizontal picture, then the situation will definitely be that the upper edge of the line is thick and the lower edge is thin, forming a flat pen with poor quality. As Da Zhongguang of A Qing Dynasty said, "It is a failure to use a center, but no center is neither good nor bad. The root of the pros and cons lies in this. "
Extended data
Pen-lifting method
The center raises the pen, which is to let the pen tip run in stippling. This method of carrying a pen is the central measure of using a pen. In Qing Dynasty, Shigemitsu said in "Green Raft": "The center can be transported, although it is defeated, it is also round; If you can't be a center, you are both good and bad. The root of the pros and cons lies in this. " It is true that the center is the main law in calligraphy, so the center is the most important in calligraphy.
The central stroke, because it is easy to lift the pen up and down, press the pen and use the front, will have different stippling, showing the interest of combining rigidity with softness and vertical and horizontal transshipment. If the carpal tunnel blocks the center of gravity of milli, make it forward.
According to the experience of predecessors, if the wrist is vertical, the front part is straight and the front part is regular on all sides, so that you can draw vertically, tighten, stretch, press, lift, and have contact with each other, and the gestures can be aligned with each other, so that the front part can be kept in the center.
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