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Locks not only retain their practical value to this day, but have also become precious historical evidences. They reflect the historical development trajectory of woodworking and hardware crafts from one aspect. Looking at locks from their materials, design, mechanical structure, mechanism, carving, calligraphy and painting, they involve multiple disciplines such as woodworking, metallurgy, forging, cold work, art, calligraphy and painting, copper wood carving, and dynamics, physics, geometry, psychology, etc., all of which can be found in locks, reflecting the conditions of social politics, economy, culture, and lifestyle throughout history. After generations of ingenious craftsmen's invention, creation, and improvement, the production of locks can be said to be billions or trillions, making it difficult to count the exact number. Looking at the locks that have been passed down, there are certainly fine products, which are the crystallization of wisdom of ancient craftsmen. It may be because locks are themselves items that reflect secrecy, and lock artisans have passed down their skills from generation to generation. Literati who have written books and established their own traditions have rarely involved themselves, leading to few records in historical texts, official histories, and unofficial histories. Therefore, there is almost a blank in the research on lock art to this day. In traditional China, happiness is one of the "Five Fortunes," indicating the importance of happiness.