Introduction to the Four Treasures Hall of the Study: Inkstone - the stone can be used as an inkstone, and the inkstone can be used for research. In the history of our country's civilization, inkstones, like pens, ink, and paper, play an extremely important role in spreading culture and art. Inkstone is a comprehensive handicraft. Among the four treasures of the study, it has the most collection value. The production and production of inkstones produced in the Yimeng Mountains reached a peak in the Tang Dynasty and into modern times.