Six hexagrams are hexagrams. With modern coins, which side is the sun?

★ Song and Ming coins (with words on one side and no words on the other): the words are the "word" side and the words are the "back" side. Distinguish yin and yang with the principle of excess and deficiency. Virtual back (without literal) represents positive, while solid back (with literal) represents negative. The three fronts are "Lao Yang" and the yang is exhausted, so the three backs of ancient books are "Lao Yang"; The recipe of three yin is "old yin" and the exhaustion of yin is "shaoyang", so the word "old yin" is used in ancient books.

★ Qing Dynasty coins (one side is Chinese and the other is Manchu): Chinese is the "character" side, and Manchu is the "back" side. Distinguish yin and yang by simple and complicated principles. The back surface with simple texture (full text surface) represents the front surface, and the literal surface with complex texture (Chinese surface) represents the back surface. The three fronts are "Lao Yang" and the yang is exhausted, so the three backs of ancient books are "Lao Yang"; The recipe of three yin is "old yin" and the exhaustion of yin is "shaoyang", so the word "old yin" is used in ancient books.

Therefore, it can be inferred that regardless of ancient and modern coins, the principle of "simplicity is positive and complexity is negative" should be used to objectively distinguish between yin and yang. Understand this truth, the distinction between yin and yang of coins becomes very clear. For example, if a foreign coin is placed in front of you, what principle do you use to distinguish between yin and yang? Pattern? Numbers? Your own subjective thoughts? Or something else? It's simple. For all coins, you don't care what shapes or patterns they are, and you don't care whether you can read them. You just need to compare the two sides. Which side is relatively complex in shape is the female side, and the relatively simple side is the male side. For another example, suppose you have three round pieces of metal in your hand, both sides of which are smooth and grain-free. How can you turn it into a tool for divination? How to define yin and yang? The answer is to mark either side of the three metals, then the marked side becomes tangible, tangible is real, while the other side is still smooth, intangible, intangible is virtual, and virtual is positive, but it is negative, thus objectively defining Yin and Yang, which can be used as a tool for divination.