This is a type of pottery called "Hotaru-yaki" (firefly-fired), which has a special construction where a faint, round light shines through like a firefly when held up to the light. It is made by making holes in the sides of the vessel when it is still semi-dry during the pottery-making process, and then applying a transparent glaze and firing it. In Japan, it is called "Hotaru-yaki," but in China, it is called "Linglong." This piece expresses the enjoyment of not only the tea ceremony but also as a work of art. This is an antique item that has been stored at home. It is a beautiful item with no chips, cracks, or breaks. It was displayed at a Chinese tea event and is likely unused.