" Time is invisible. Unlike weight.
Ah, but maybe that wasn't true. You could feel weight, yes--when you were carrying too much, it made you ploddy--but wasn't it, like time, basically just a human construct? Hands on a clock, numbers on a bathroom scale, weren't they only ways of trying to measure invisible forces that had visible effects? A feeble effort to corral some greater reality beyond what mere humans thought of as reality? "

― Stephen King , Elevation