15th century
Height 28.4 cm, mouth diameter 8.6 cm, body diameter 14.2 cm, bottom diameter 11.3 cm
　Technological advances made it possible to grind even taller vases at once, and the method of making and joining individual parts was replaced by grinding the entire form in a single stroke. The shape of the bowl has therefore also changed, and the border between the oral part and the body has disappeared, making the bowl one piece. The iron glaze also became more stable and the black axis could be obtained.
