Page "religion" Paragraph 148

We have already seen that odd numbers were considered as being Yang, while the even numbers were Yin, so that the eight outer numbers of the Lo Shu represented these two principles in balanced equilibrium around the axial center.

During the Han dynasty, another Yin-Yang conception was applied to the Lo Shu, considering the latter as a plan of Ancient China.

Instead of linking the nine numbers of this diagram with the traditional Nine Provinces, as was usually done, this equated the odd, Yang numbers with mountains ( firm and resistant, hence Yang ) and the even numbers with rivers ( sinuous and yielding, hence Yin ) ; ;

taking the former from the Five Sacred Mountains of the Han period and the latter from the principal river systems of Old China.