Luoshu, Chinese 洛書 luò shū, also Loshu, literally “Book of the river Luo”: This is a square composed of further nine squares. In this square the cardinal numbers are arranged in such a way that the total in every direction is always 15:
According to a legend, a tortoise had got out of the river Luo wearing on its shell the arrangement of these numbers.
The Luoshu has been related to the compass directions and the trigrams and forms the bases for feng shui evaluations. The Later Heaven Ba Gua has been developed from the Luoshu.
See also Trigrams
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Luoshu