Poetry tells us that time “passes”, it moves like a river, inexorably dragging us with it, and, in the end, washes us up on its shore while it continues. Metaphor tells us time is money, a commodity for us to budget, invest, spend, or waste. Language tells us time has volition: it flies, drags, stands still. The verbs alone suggest that we have always understood time as subjective, something experienced according to individual circumstance.
Yet, between past and future, cause and effect, memory and hope, regret and intention … in the physics elementary laws that describe the mechanism of the world, apparently there is no such difference.
Clock time, is an illusion…according to Einstein.