A New Biography of Chang'e Flying to the Moon

Zhao Yunxi took out three tops that he had prepared early in the morning. Each top had four chambers. He put them together in a sealed glass jar and used internal force to urge them to rotate. The three tops rotated faster and faster, and finally they seemed to merge and merge. Only one top was seen rotating. Zhao Yunxi said: "If each top represents a time and space, when three tops merge and merge, it will be the time when time and space overlap."