What is Feng in calligraphy?

Feng refers to the method of using a pen, which is the name used by calligraphers to better describe the method of using a pen. In fact, it refers to the "transparent part near the tip" mentioned by rera555 upstairs. This part is the main part when we write, so how do we use it when we write? Therefore, the names of various brushstrokes should be born, such as center, flank and reverse. And the shape of the lines and the writing method will be the same. Every family has different methods, and each method has various names. The unique application of each method also forms the characteristics of each calligraphy. It has little to do with strength, but is closely related to angle!