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The established language for communication with suprahuman intelligences was based on numbers and their symbolism. The fundamental principles of the world are heaven and earth, spirit and matter. Earth is the derived principle; therefore the number two is assigned to it. Heaven is the ultimate unity; yet it includes the earth within itself, and is therefore assigned the number three.
The number one could not be used, as it is too abstract and rigid and does not include the idea of the manifold.
Following out this conception, the uneven numbers were assigned to the world of heaven, the even numbers to the world of earth.
--The Book of Changes