The earliest record similar to the "brain in a vat" hypothesis is "Zhuang Zhou's Dream of Butterflies" in ancient China. "Zhuangzi: On the Equality of Things" records: "In the past, Zhuang Zhou dreamed of a butterfly, and a lifelike butterfly was also a butterfly. He said that he was in harmony with his will, and he didn't know Zhou Ye. Suddenly he felt aware of it, and he was worried about Zhou Ye. If he didn't know Zhou, his dream was a butterfly, and the butterfly's dream was Zhou Yu. "Zhou and the butterfly must be different." That is to say, once upon a time, Zhuang Zhou dreamed that he had become a butterfly and felt so free that he forgot that he was Zhuang Zhou. After waking up, he was horrified to find that he was Zhuang Zhou, but he didn't know whether it was Zhuang Zhou who dreamed that he had become a butterfly, or a butterfly who dreamed that he had become Zhuang Zhou. This is the intersection and change of other things and self. This seemingly absurd story shows Zhuangzi's unusual way of thinking and his thinking that transcends ordinary people's spiritual and life realms.