Can calligraphy be put outside for internal use?

Of course. Inward (yè) and outward extension are a set of concepts that we often encounter in the process of calligraphy learning. Its correct meaning has always been interpreted differently in the history of books. In Kangxi dictionary, "yè" means: "Press with one finger." That is, press it with one finger. Collapse, that is, pressing in one direction. "Drag" means "carry things by hand, push things by hand", pointing up and pushing up.

From the discussion of the methods of "invagination" and "outward expansion", it can be seen that when "invagination" occurs, food, middle finger and ring finger "press" the pen holder, pulling inward or turning right. At the same time, the thumb "holds" the pen and pushes it to the left, so the "extension" is completed at the same time. Using this method is two actions, two directions and one process. This is done at one time. In other words, "internal conflict" and "external expansion" cannot be completed separately.