So what is the center of calligraphy? The concept of center probably arose from the Ming Dynasty. Because Zhu Zhishan couldn't read his handwriting clearly, he was attacked to write on the front side, and then he said he was a front and center.
With the development of this era, people have given the center more and more connotations. In Shen's place, the center is stippling, and the pen tip is perpendicular to the paper.
Later, people's understanding of the center increased by two points. To sum up, it is to stand up and kill the paper. Another point is that in the process of lifting the pen, the nib is not completely perpendicular to the paper. He will inevitably tilt in the operation until the stroke ends and can be perpendicular to the paper. Others say that the cross section of the nib is perpendicular to the paper. Su Dongpo has a saying that is very good, and the pen is like a rope.
Whether the front is vertical, its purpose is to improve the brushwork. As Mrs. Wei said, I will try my best to deliver it. This is exactly what the theory of "painting sand with a cone" says. The first stroke is more powerful perpendicular to the paper, and the second stroke is more powerful perpendicular to the paper. This is the true meaning of the center!