From Yu Wenbao's Record of a Clear Night in the Song Dynasty: "Fan Wenzheng [in Chinese] Gong Zhenqian Tang was recommended by all soldiers, but Su Lin did not record it alone, but offered a poem saying,' The moon is near the water tower, and flowers and trees are easy to meet spring in the sun'".
Fan Zhongyan, a famous politician and writer in the Northern Song Dynasty, is very generous to his subordinates and often recommends his followers to be officials. It is said that when he was an official in Zhejiang, all his subordinates recommended him to be an official. Only one person named Su Lin was not recommended by Fan Zhongyan because he was on a business trip. Therefore, Su Lin wrote a poem: "It is easy to turn flowers and trees in spring when you get the moon near the water tower." It seems to be chanting pavilions, flowers and trees, but in fact it implies that the benefits have been taken away by others, but they have not benefited themselves. How clever Fan Zhongyan is. After seeing his poems, he understood what he meant. Therefore, he wrote a letter of recommendation to promote Surin. This poem later became a well-known idiom, used to laugh at those who use their position to seek benefits for themselves or their cronies. -Baidu Encyclopedia webpage link