Sadness is an unusual word.

The word "sadness" is a common Chinese character, not an uncommon one. However, in the world of Chinese characters, there are many beautiful, ancient and artistic rare words, which often appear in ancient cultural heritages such as poems, articles and calligraphy works.

For example, the word "twill" refers to something similar to a belt woven with silk and cotton. Because it needs to be processed in the process of making yarn or silk, the word vividly describes a hand and a hook at work. In modern society, the use of words such as "ribbon" is more common, so "twill" has gradually faded out of people's sight.

For another example, "toad" refers to the frog jumping in the "rabbit" pattern on the moon, so the word describes a frog, a moon and a running rabbit from top to bottom in turn. Although the word "toad" appears less frequently, it is still often used to describe moonlight and natural scenery in poetry.

In addition, there are many rare words with artistic characteristics, such as, twips, yue, etc. Although they have gradually faded out of the writing and use of modern Chinese, they will still be used in literary creation, calligraphy art and personal collection.