Introduction to Gao Jingshi: According to legend, Song Gaozong, the son of Song Huizong who was obsessed with stones, wrote an inscription himself and gave the three lake stones "Cangyun", "Gao Jing" and "Zhongyi" to Prime Minister Zhao Gui. After the changes of the times, only Gao Jingshi, a precious gem with the characteristics of "openness, transparency, wrinkles and leakage", is preserved.