It is normal to miss a horizontal line in calligraphy inscriptions. Often calligraphers will process a word in order to achieve the beauty of the word. For example, in many calligraphy works, the character "德" will be missing the horizontal line in the middle. This kind of character is not a typo, nor is it completely a variant. These characters usually appear in calligraphy works, but are rarely used in actual writing, so this Zhongzi is also called Beibiezi. It means calligraphy using words.