Chokkan
It is one of the shapes of bonsai trees, which refers to formal upright style with a single upright trunk. Considered the most basics of the bonsai tree shapes, it is the ultimate beauty of bonsai. Chokkan’s typical appearance when viewed from the front shows itself almost in a triangular shape. It is considered necessary for it to meet strict conditions such as maintaining overall balance, bilateral symmetry and a sense of unity. The trunk and branch must maintain an upright style. The trunk remaining in an upright style is generally said to be difficult.
translated by Kyodo News