Introduction to cliff carvings: From 1969 to 1971, due to the construction of water conservancy facilities, the country had to move some of the most respected 13 cliff carvings in the reservoir submerged area to the Hanzhong Museum. These stone carvings and calligraphy works are known as the "Thirteen Products of Shimen" and are hailed as "treasures of the country". These calligraphy works are called "pin" because the words are engraved on the stone slabs.