Ancient copper coins, square holes with round bodies, symbolize "Heaven is round, Earth is square." They carry calligraphy, measure, and the concept of existence and non-existence, allowing us to see the flow of thousands of years of merchants' exchanges and cultural融合. Collecting them is not only preserving a tragic history and top-tier minting art but also safeguarding a nation's memory that will never be forgotten. Their cultural and market value endures and becomes more precious over time.