These vessels are made in Yixing, the Chinese capital of quality ceramics for Bonsai.
Given the handcrafted nature of the vessels, there may be small differences in the size of the vessel, or slight variations in the hue.
The word Bonsai, consists of 2 characters, which mean "tree in pot", so the importance of the vase in this art, is (almost!) equal to that of the plant.
Esthetically, "the vase is for Bonsai, as the frame for the picture", he should highlight the beauty of the plant, without stealing his attention, different styles of Bonsai require different types of vessels.
Horticulturally, the Bonsai vase has to have certain chemical and physical characteristics that allow cultivation for long periods of a tree in its interior, these objectives are achieved with the use of high quality grates and specific manufacturing processes.
For more information about vases see:
