《梦溪笔谈·艺文一》
后以诗意未全，用语未工，改第三句为 人面只今何处在 。
后以其意未全，语未工，改第三句曰： 人面只今何处在。 
Later because the poetic idea is not complete and the usage of the text is not skilled, the third sentence is changed to "People's appearance is now where".