Koshidaka is a Japanese term that refers to the distance between the base of the tree and the first branch in bonsai. It is often seen in trunks of literati style, which is a minimalist and elegant form of bonsai that emphasizes the line and movement of the trunk. Koshidaka can also mean a tree with a high waist, which is not desirable in most bonsai styles. A high waist can make the tree look unbalanced and unnatural. Koshidaka can be avoided by selecting a suitable material, pruning the lower branches, or grafting new branches near the base.