Yaotai: the legendary place where immortals live. Source: Mu Biography Volume III: "The son of heaven is a guest of the Queen Mother of the West, and the son of heaven is above the Yaochi. The Queen Mother of the West is the son of heaven, saying,' White clouds are in the sky, and mountains and rivers come out. It's a long way, and my son can come back and not die.' The son of heaven replied,' Return to the East Land.
Yao Taiwan mirror again, to the white clouds dancing section refers to:
I also suspect that it is the fairy mirror of Yaotai.
Fly above the blue sky.