The expression of Chinese calligraphy on ceramics might have appeared as early as the Tang dynasty （8th Century） and became quite mature by the early Ming dynasty (14th Century) . The Ailin Museum has two pieces that might be among the earliest known examples of ceramic calligraphy art. One is a large green-glazed bowl with incised "Hundred Longevity" characters (link), created using a high-relief carving technique to inscribe over one hundred different seal script characters for "longevity" on the surface of the clay. The other is a red-glazed vase from the same period, on which the artist masterfully hand wrote the entire poem "A Song of Running-Horse Mountain in Farewell to General Feng on His Expedition to the West" by Tang dynasty poet Cen Shen, totaling around 120 characters, in fluent calligraphy on the vase's body.