What is the wrapping front in calligraphy?

That's not the right question.

Wrapping the front is one of the techniques of Chinese painting. Is to wrap the nib together.

There are two ways before wrapping: one is before twisting the pen bag; One is to turn your wrist into a pen. Wrapping the front is an instantaneous state in operation, and the front will spread out and be wrapped again. The drawn lines have a distorted feeling, which makes the ink color change alternately. This painting method is suitable for drawing vines and so on.