Ancient Chinese people believe that the sky is round, the earth is square, namely 。。。。

The sky is round, and the essence of the source of the sky is round, is derived from the evolution of the eight trigrams of the first day, the deduction of heaven and earth is the operation of the map: the sky is round, and the map of the earth. Which the external surrounding trigrams, on behalf of the operation of the laws of the sky, and the middle of the square arrangement of the trigrams, on behalf of the operation of the laws of the earth. Among them, the sky is the main, the earth is the second, the sky is the yang, the earth is the yin. The two senses each other, generating the heaven and earth, where people happen to be the essence of the material composition of heaven and earth, and therefore is regarded as the spirit of heaven and earth, able to sense all things, the most spiritual also.