Anicca is one of the three marks of existence: all conditioned phenomena are impermanent. Not merely 'things change' but 'what you call a thing is itself a process of changing.' The Visuddhimagga maps forty stages of insight into impermanence, each subtler than the last. Hex 32 (Duration) seems to contradict this — but the I-Ching's concept of duration is not static permanence. 'Duration is a state whose movement is not worn down by hindrances.' Duration is the persistence of change itself — the pattern that endures while its contents are constantly replaced. Hex 49 (Revolution) is the other face: when the accumulated changes reach a threshold, the old form is shed entirely. Molt. Metamorphosis. The Buddhist insight and the I-Ching agree: what endures is the law of change, not any particular arrangement.