Is there anything out there that is not unique? Every single atom is unique, every moment is unique. And it is changing all the time. There is a new universe being created every Planck Time unit! The eastern and western philosophers seem to get the idea of impermanence roughly around 500 BCE (around the same time), eith Buddha’ s impermanence principle and Heraclitus’ famous quote: “No man ever steps in the same river twice, for it’s not the same river and he’s not the same man.”