Hachiutsuri is a Japanese word that means the harmony or balance between a bonsai tree and its pot. It is one of the criteria for judging the quality and aesthetics of a bonsai. A good hachiutsuri depends on the shape, size, color and style of both the tree and the pot. For example, a slender and delicate tree would match well with a shallow and round pot, while a strong and vigorous tree would suit a deep and angular pot. The choice of pot also reflects the natural environment of the tree, such as mountainous, coastal or tropical. Hachiutsuri is not a fixed rule, but a subjective impression that can vary depending on the preference and experience of the bonsai artist or viewer.