In order to commemorate the continuation of Confucianism from this remnant wall, the descendants of Confucius built this wall in the well of Confucius' former residence as a symbolic memorial place. When they carved the word "Ruby", they deliberately wrote the word "Ruby" as a left-right structure, indicating that there was a gap in the wall, and added a dot on the following soil word, suggesting that there was something in the soil.

The Lubi of Kong Fu Temple is located behind the poetry hall of Confucius Temple, which is said to be the place where Confucius, the ninth grandson of Confucius, hid ancient books on the back wall of Ying Zheng, the first emperor of Qin Dynasty. During the period of Emperor Wu of the Western Han Dynasty, Wang Liuyu of the Principality of Lu greatly expanded this palace garden.

In order to commemorate the protection and inheritance of Confucian culture by Ruby's collection of books, another dish was added to Confucius' menu, and its name was Ruby's collection of books.