The story of calligrapher's diligent practice of calligraphy (omitted)

It is said that Zhong You, a great calligrapher in the Three Kingdoms period, often invited Zhao Hu to practice calligraphy on stage and learn calligraphy from his predecessors. Over time, bald pens piled up like mountains, and the written papers were discarded in piles. The water in the pool was washed black because of washing pens and inkstones.

Huai Su practiced calligraphy and wrote a mountain of words, nicknamed "Pen Tomb".

According to legend, Wang Xizhi often went to the pool to wash inkstones after practicing calligraphy hard in his childhood. After a long time, the water in the pool turned black, so people called it "West Wild Goose Lake" and ancient scholars also called it "Mo Chi".