Koudai

Koudai is the part of bottom which touched with ground. It supports work from under ,so to keep firmly or not is depend on koudai. Koudais have verious patterns. Commonly koudai's shape is circle but sometimes square like. Famous AritaYaki works are tend to be alike ratio of kodai's size. (in details, 1:3:1=width : inside circle diameter : width
)