Next, I will explain the relationship between the Five Elements Theory and the Yin Yang Theory.

These two theories were originally two separate theories but were later combined. First, I will explain the Yin Yang Theory.

Originally Yang meant the heaven and Yin meant the earth. Yang means something that cannot be actually touched, and Yin means something that can be actually touched. For example, the sun is fire that cannot be touched, while fire on the ground is fire that exists close to us. In terms of the human body, the spirit and the functions within the brain cannot be directly touched, but the human body can be directly touched. Thus, the sun and spirit are yang while fire and the body are yin.

Each of these 5 elements has a Yin and a Yang (sub) elements, so there are 10 elements in total. Each of the ten elements has its own meaning, which is expressed by one Kanji.

The following chart shows the classification of the five elements into yin and yang and the Chinese characters are given for each entry.

甲(jia) is trees other than those that are edible, 乙（yi）is food for sustenance.

 丙(bing) is the sun or fixed stars. 丁(ding) is fire used in daily life.

 戊 (wu) is mountains, places that people do not usually enter, 己 (ji) is living spaces such as cultivated fields and towns.

庚 (geng) is steel and weapons, 辛(xin) is precious stones, etc.

壬(ren) represents rivers, oceans, and water streams used for logistics, and癸(gui) represents water used for drinking and daily life.