Ch: Yaoshan Li'ao. A Zen 禅 painting subject depicting the philosophical debate between the Tang dynasty hermit-priest Yaoshan Weiyan (Jp: Yakuzan Igon 薬山惟儼, 751-834) and the provincial governor Li Ao (Jp: Ri Kō 李翱). Their dialogue is recorded in the Zutangji (Jp: Sodōshū 祖堂集) and Jingde chuandenglu (Jp: Keitoku dentōroku 景徳伝燈録, 1004), and later the story became a famous teaching parable kōan 公案.
Li, long desiring an audience with the famous Yaoshan, travelled to the master's mountain retreat only to be completely ignored by the priest. Li criticized his rude host, saying "seeing the face is not hearing the name," whereupon Yaoshan called out "Governor!" When Li responded to the word, Yaoshan asked him why he favored hearing over seeing. When Li asked what is the Dao, the priest responded by pointing up then down, then explained to the puzzled official that "clouds are in the sky, water is in the jar."
Among paintings of the subject, Ma Gongxian's (Jp: Ba Kōken 馬公顕, act. mid-12th century) hanging scroll at Nanzenji 南禅寺, Kyoto, was probably the most influential for Japanese artists of Muromachi period who created ink painting.