Apart from the obvious experience that time’s arrow moves only one way, so that the past is always growing while the future diminishes (unless each is infinite), the past has been ‘passed’ through the filter of being present, in the process acquiring embodiment, richness of human meaning and uniqueness. By contrast, the future is a theoretical projection, general, disembodied, and free to accept whatever meanings we care to throw at it. In that sense the future is all theory.
