Extended data
The center pen can be used even in calligraphy and painting, but it is necessary to explain clearly the off-center part and the use state at that time. When the center uses a pen, he must have certain skills when carrying it. Liu Xuzai, a calligrapher in the Qing Dynasty, put forward the viewpoint of "going backwards, not moving smoothly and closing tightly", which highly summarized all the skills of writing with a pen. That is to say, the middle stroke stage is not smooth when entering the pen, and the back stroke is used when closing the pen at the end of the stroke.
As we know, the nib is conical. If you don't start writing with a backswing, the starting point of the line will become conical, which requires rounding the starting point of the line.
In the process of running in the middle, the pen tip can't be a straight line like the trajectory of billiards, but slightly swings up and down. The way the pen tip moves forward is not to go forward bravely, but to take three steps, take a step back and swim a circle. Of course, this tour is very small.
Through the feeling of the writer's fingers, or from the written works, people who look at it may not be able to observe it carefully), the ink is repeatedly piled up in a certain range, reflecting the three-dimensional sense, which is astringency. This effect is what the ancients called "leak marks".
It is completely wrong to introduce the concept of "poor pen tip" to explain the "leakage mark" mentioned by the ancients, because the pen no longer presents the original conical shape during operation. In the process of lifting the pen, there is a collar in front of the pen, which controls the collar direction and gets the "leakage mark" in calligraphy.
When the pen runs to the end of the line, if the pen is naturally closed, the end of the line will be exposed. It is reasonable for the exposed front to appear in the straight painting, but it is vulgar in the horizontal painting. Therefore, the end of the line must be regarded as a hidden front by retreating the front. The second function before returning to the pen is to adjust the pen.
We know that when the pen tip runs to the end of the line, the pen tip has tilted backwards. By going back to the previous process, adjust the nib correctly and prepare for writing the next stroke.
References:
Baidu encyclopedia-center pen