What's the difference between reverse writing and positive writing in calligraphy?

The counterattack should be Fang Bi. Corresponding to it is the front. Tibet Front has nothing to do with this. If you write back, you will hide it. "corresponding to dew"

Personally, the calligraphy of round pen is nothing more than: going against the trend, showing Fiona Fang's sudden break, turning black and white, dense and dense, oblique and loose, interspersed with yin and yang, and combining rigidity and softness.