Stepped pot with celadon glaze, Guan ware, Southern Song-Yuan dynasty, 13th-14th century. Height 14.4 cm, mouth 9×12.5 cm, foot 9.3×12.4 cm.  National Palace Museum, Taipei.

The rectangular vessel is made of three connected layers, with bulging walls, a narrow folded edge protruding from the mouth, a flat bottom, and a rectangular short foot. The fetal bone is slightly thicker and is fired using the pad firing method, with glaze applied inside and outside. After firing, the color is beige and slightly gray, with brown flakes appearing in some areas. The edges of the soles and feet are glazed, and the ends of the feet are brushed with ocher juice.
The surface of the vessel inside the foot is engraved with an imperial poem by Emperor Qianlong "Ode to the Three Deng Bottles of the Official Kiln", which reads:
"The secret vessel is made by repairing the inside, and the pottery is clear with age. The remaining glory of the fire is only cracked and fine lines of ice. The spirit is strong, and the flaws are There is no time for cultivation. When I retire and play with antiques, I will wish you three times."
At the end of the poem, it is signed "Qianlong Jiawu Jichun Imperial Title" (the 39th year of Qianlong: 1774) to commemorate the year, and is stamped with the two seals "Knowing Heart Not Far Away" and "De Chong Fu".
Comparing the images of altars listed in "Nongshu" by Wang Zhen of the Yuan Dynasty and the shape of "Guoshe", we know that Emperor Qianlong viewed this object and associated metaphors related to it from the shape of the vessel. Then borrowed from "Han Shu." "Shi Huo Zhi 1" records the allusion of twenty-seven consecutive years of good harvests, expressing his expectation that the dynasty under his rule will also have good harvests and the world will be peaceful.
There are three other Qing Dynasty artifacts in the collection of the courtyard with similar shapes. In addition to revealing that Emperor Qianlong issued an order to imitate and inspect the cultural relics, the imitation (old porcelain 013487) is more like a "national society" in shape. This supports his idea of seeing this vessel as a harvest altar. Similar specimens have been found at the Tanxiaguan kiln and Laohudong kiln sites in the suburbs of Hangzhou, Zhejiang Province. (Google traduction)