What unremarkable objects in life contain rich China culture?

At first, I saw a news that innovative chopsticks invented by Japanese were very popular in South Korea, but I didn't know the rich China culture contained in chopsticks. First of all, chopsticks have round ends and square ends. The circle symbolizes the sky. The symbolic place of the square corresponds to the circular place; This is the basic principle for China people to understand the world. Secondly, when holding chopsticks, the thumb and index finger are up, the ring finger and little finger are down and the middle finger is in the middle, which is the image of three talents in heaven and earth and China people's understanding of the relationship between man and the world; Then, China people abide by the concepts of Tai Chi and Yin and Yang. Tai Chi is one, Yin and Yang are two; The explanation of water is as follows: one divides into two, which means that everything is composed of two opposites; Combine into one; This combination of yin and yang also means a perfect result.