In ancient China, cranes were often regarded as a symbol of longevity, and when they died, they were compared to "riding cranes to the west". As an auspicious bird, cranes are accompanied by immortals. Therefore, there are euphemisms for death, such as going west, visiting immortals, dying in the west, becoming immortals and so on. From Deng Youmei's "Wu Na": "The old lady will keep her word. Soon after this, she will drive the crane west and Ziyun will take care of her family."
"Drive a crane to the west and disappear into the clouds forever." It is the elegiac couplet made by later generations, expressing people's thoughts and blessings for their deceased relatives, and also comforting themselves: disappearing into the clouds is not a relief, at least it can stay away from the hubbub and sleep in the sky.