It is called a 琮-shaped bottle because its shape imitates the 琮, an ancient Chinese jade product.
In Japan, the vertical and horizontal straight lines protruding along the corners of the torso look like calculus used in fortune-telling, so they are called 'calculator hands' and have been enjoyed in tea ceremonies. I was.
This product was also inherited from a tea house, and is a celadon-shaped bottle from the Ming dynasty, not the Song dynasty.
The condition is perfect, and it is a heavy and thick celadon.