Yin and Yang
two ancient entities, opposing but complementary, which symbolise the duality present in every element of the cosmos. Yin and Yang cannot live without one another, otherwise they would both be incomplete and the equilibrium of the entire universe could be compromised. The union of Yin and Yang form the Tao, present in any element and graphically made up of one black part and one white part. The black part, Yin, is the negative and feminine principle and the white part, Yang, is the positive, masculine principle. Yin, originally, was the name of the cold side of the mountain, the part facing north; on the contrary, Yang was the warmer side, facing the south.