Humans love to categorize things. It helps them to understand the world. You can already see that in very young babies when they develop their speaking skills. For example, first they only distinguish people and animals and so it can happen that all animals are called dog until the baby understands that a cat has 4 legs as well but is different from a dog. As development and understanding grows children become able to distinguish even different kinds of dogs.
As we become older we continue to put everything into boxes especially other humans. We sort them by all kind of categories: ethnicity, gender, age, origin, religion, job, education, political or sexual orientation, body shape, wealth, and so on and so on.
However, even though we keep categorizing, we wish to be perceived as individual or unique at the same time, so once in a while somebody opens up a new category because he/she believes not to fit in the existing ones. Thats how we ended up with a huge variation of gender definitions, fashion styles or political opinions.
This development is supported by the dominance of yang qi which tends to grow more and more branches into all kind of directions until they become uncountable.
However, as the nature law demands, when yang reaches its peak, it switches to yin and the striving to the outside makes way for the return to the core.
Concerning the categorizing of people that means, we need to start looking for the things we have in common more than for what distinguishes us.
Under the influence of yang humanity was striving for individuality just to find themselves in more and more categories. Under the influence of yin humanity will strive for find what we have in common to find that we are all individual.
Thats how there is always yin at the core of yang and yang at the core of yin.
Black Dragon