over 22 years References External links Liezi book 5, translated by Lionel Giles, on wikisource "The Foolish Old Man Who Removed the Mountains", a translation of Mao's 1945 speech on marxists.org The Foolish Old Man Removes the Mountains, Xu Beihong's painting in the Singapore Art Museum Chinese philosophy Chinese mythology Taoist philosophy Taoist texts Confucian texts Maoism Fables de:Yu Gong