Wu Gang, formerly romanized as Wu Kang and also known as Wu Zhi in some sources, is a figure in traditional Chinese folklore and religion. He is known for endlessly cutting down a self-healing osmanthus tree on the Moon, a divine punishment which has led to his description as the Chinese Sisyphus. In modern Chinese, the chengyu "Wu Gang chopping the tree" is used to describe any endless toil. The specific reason for his situation has varied in the sources, but Wu Gang's story dates back to at least the Tang dynasty.
Legend
Origins
An etiological myth for the moon's phases was that a great forest or great tree grew there, swiftly growing and losing leaves and blossoms over the course of each month. After the expansion of the Chinese cultural area south of the Yangtze River during the Qin and Handynasties, the lunar trees became associated with the fragrant and white-blossoming osmanthus. This tree flowers during the autumn and promoted the connection of the Chinese harvest celebration with the Moon, a connection still observed during the modern Mid-Autumn Festival. Confections and wine flavored with its blossoms are also still associated with the holiday. By the time of the Han, the Book of the Master of Huainan associated the waxing of the moon with trees growing from the feet of a Chinese immortal. In his Compendium ofMateria Medica, Li Shizhen explains that Wu Gang was added to the stories about the holiday from novellas published during the Sui and Tang dynasties.
First version
The 9th-century Miscellaneous Morsels from Youyang mentions a lunar tree over five hundred feet high and says that Wu Gang of Xihe stood under it. It relates that other immortals were sent there to chop the tree when they made a mistake.
Second version
Wu witnessed a liaison between his wife and Yandi's grandson, after the two had already carried on an affair so long it begat three sons. In a rage, Wu murdered his wife's lover but Yandi ordered Wu banished to the Moon, where he would cut down a tree. After each blow, the tree healed itself and Wu was therefore forced to cut at it forever.
Third version
Another version features a cherry bay. In this version, Wu Gang began the attempt to become a Taoist immortal but gave up lazily midway through the process. The Jade Emperor was furious and decided to punish him. The Emperor created a cherry bay on the Moon and Wu Gang was invited to chop it down in order to become an immortal. Wu Gang tried, but again the tree healed itself and the task was impossible. The shadows on the Moon are said to be created by the growing cherry bay.
Fourth version
In yet another version, Wu found a teacher in the mountains in his quest for immortality. When his teacher taught him to heal, he gave up after three days. When he was taught to play Chinese chess, he gave up after two days. When he was taught the method of eternal life, he gave up after a day. His teacher then sent him to the Moon to chop down the tree.
