Toads symbolize good luck and were sacred in ancient China. Judging from the development track of worship, stories, pictures and texts, China has a toad culture. Toad was originally unsightly, unattractive, extremely vital, able to withstand the "divine power" equivalent to ten or twenty times the weight of the body, and also spiritual.
The ancients associated toad's "divine power" with the moon that turned from surplus to deficit and surplus in the sky. There is a toad in the portrait of the moon in Han Dynasty. People think that the toad on the moon is closely related to the chaos control in the world. Justin's manuscript "Five Elements of Justice" said at the back of the book "River Map": "The toad went to the moon, and the world was in chaos."