1. Historical value: Ni Tongyong is one of the outstanding representatives of contemporary calligraphy. His works have witnessed the development and evolution of contemporary calligraphy art, which can provide future generations with reference and understanding of the development of contemporary art and have historical and cultural value.
2. Scarcity: The number of Ni Tong's works is limited, especially his high-quality works are scarce. With the passage of time, the number of these works will be further reduced.