This concept stems from The Book of Changes. “Disappearance and reappearance”signifies the cycle of departure and return pertaining to a journey, but is also extended to the abstract meaning of disappearance and reappearance of things or states of things. In the hexagram context of The Book of Changes, tai (泰) hexagram has qian (乾heaven) at the bottom and kun (坤earth) on top. This hexagram is situated at the junction of qian and kun, the pivotal point where shifts are imminent. Though qian starts from the bottom, it ultimately returns to the top, and while kun begins from the top, it eventually returns to the bottom. The concept that nothing that disappears fails to reappear uncovers the law of transformation for things or states of things.