What is the writing background of Wang Anshi's The Wall of Mr. Hu Yin?

Wang Anshi failed in political reform and went on strike twice. The Wall by Mr. Hu Yin is a poem written by Wang Anshi for his neighbor Yang Defeng. According to historical records, after the failure of the political reform, Wang Anshi went on strike twice and lived in seclusion in his hometown Jinling (now Nanjing, Jiangsu) in his later years. During this period, he had close contacts with Yang Defeng and visited Yang's home many times. Yang Defeng is a hermit, nicknamed Mr. Hu Yin, so Wang Anshi wrote him on the wall of his neighbor's house. This poem describes Mr. Hu Yin's courtyard and environment, as well as his love and yearning for nature.