Mo Chi is related to which calligrapher practices calligraphy hard.

Wang Xizhi began to learn to write at the age of seven. There is a pool in front of his house. After Wang Xizhi finished writing every day, he went to the pool to test his writing brush. When practicing calligraphy, the pool in front of his house turned black. _ Later generations called that pool "Mo Chi". His son Tu Xianzhi also began to learn to write at the age of 7, and he was very attentive. One day, while Wang Xianzhi was practicing calligraphy, Wang Xizhi sneaked behind him and suddenly wanted to pull out his pen. Wang Xianzhi clutched the pen tightly without being pulled out by his father. Wang Xizhi said that this child will hopefully practice his handwriting well in the future. His pulling out is actually a test for his son to see whether he uses the pen correctly and whether he has enough strength to hold it. Later, Wang Xianzhi was impatient with practicing calligraphy, so he asked his father what the secret was and how to practice calligraphy in the shortest time. Wang Xizhi took his son to the yard. There were 18 vats in the yard, and each vat was filled with water. Gong Xizhi said that you will know where the secret is when you finish writing the water in the 18rl cylinder. Under the education of his father, Wang Xianzhi worked hard in the right way and eventually became a famous calligrapher.