The twisted trunk style of bonsai, also known as nejikan (ねじ幹) in Japanese, is a style that features a trunk with one or more spirals or twists. This style mimics the natural appearance of trees that have been exposed to strong winds or other environmental factors that cause the trunk to bend and twist. The twisted trunk style can be applied to various species of bonsai, such as pomegranate, plum, juniper, and pine. The bark of the tree should complement the twisted shape of the trunk, and the branches should be minimal and balanced. The twisted trunk style is a challenging but rewarding style that requires careful wiring and pruning to achieve the desired effect.