“No man ever steps in the same river twice, for it’s not the same river and he’s not the same man”. Heraclitus, a pre-Socratic Greek philosopher born in in 535 BC, coined this statement, meaning that no entity may ever occupy a single state at a single time. However, his “colleague” Parmenides disagreed. Instead, he called reality “what-is”, meaning that change is simply the false appearance of a changeless, eternal reality. In short, Heraclitus believed that things exist as “processes”, while Parmenides believed that things exist as “states”.