The main trend under the haven is that
what has been long divided, must unite;
what has been long united, must divide.
Yin and Yang are opposite to each other but unite in one direction.
Change is the real permanent golden rule.
All the objects and events between Heaven and Earth.
陰Yin：合 Unite, Unity… 陽Yang：分 Divide, Diversity…
Unity in Diversity 求同存異。博大精深。見微知著。對立統一。