There are many auspicious numbers in Lubanchi, and different numbers also represent different meanings.
Lu Banchi, also known as "door light ruler":
Lu Banchi is a popular building tool in ancient China. Generally used to measure and determine the size of residential doors and furniture. It is called "Luban Town Pool" and "Luban Zhou Chi" in Luban Jing and Luban Jian Zheng. In ancient times, people thought that the portal determined according to the auspicious size of Lu Banchi would shine brilliantly and bring good luck to the family, so Lu Banchi was also called "door light ruler".
Because one foot in Lu Banchi is divided into eight inches, and each inch is written with expressions expressing various meanings, people also call Lu Banchi "eight-character foot", "door ruler" and "door meter".
Ancient Kanyu attached great importance to the application of Lu Banchi. "Ten Books of Yangzhai", a book of geomantic omen, said: "There are several kinds of door rulers in China, which have been tried and tested, but this ruler (Lu Banchi) is real. There is no difference between good luck and bad luck. Guy Xi lost his job in the class. His job was made of wood, so he was poor, so he created a ruler, and later he was named Lu Banchi. There are uninterrupted measuring doors, and all beds and room appliances should use this. "