In our daily life, we often hear the saying that a person is better than a person who is good at it. This sentence actually comes from a sentence in "Encouraging Learning" by Xunzi, a famous thinker and educator in ancient my country. It is usually used to describe students who have achieved more than their teachers after studying and working hard.

But some people may be curious. There are actually a lot of descriptions of colors in this old saying. In ancient my country, the color related was cloth. So what is the connection between this sentence and cloth? The origin of this sentence actually comes from the admiration of the ancients who discovered a strange phenomenon when extracting the color of dyed cloth from plants.

In ancient times, when people dyed cloth, they extracted dyes from plants. Among many plants, there is one plant that can extract blue color, and that is Polygonum indica. During the extraction process, an indigo color that is more beautiful than blue will appear, and this indigo color is extracted from blue.

This color will also be darker and more beautiful than blue. Therefore, this sentence in "Encouraging Learning" is used to describe a relatively positive teacher-student relationship. This metaphor is widely used nowadays, and this sentence is often used to praise students for their efforts and study.

Therefore, blue is better than blue. This sentence is actually closely related to ancient dyeing technology. With the emergence of this new color, more colors are provided for people's clothes, making clothing more diverse and colorful. From this we can also see the wisdom and exquisite craftsmanship of the ancient working people.