Who and how.

Consider that we are mobile creatures, necessitating a sequential process of perception, with frequent sorting and judging of the aspects of our perceptions, in order to navigate,. Then, as humanity, we tell stories to one another and build civilizations out of the collected knowledge, so the passage of time, the present moving past to future, is foundational to who we are. Yet the reality is that change turns future to past. Tomorrow becomes yesterday, because the earth turns.

There is no literal "dimension" of time, because the past is consumed by the present, to inform and drive it, aka, causality and conservation of energy. Cause becomes effect.

The energy is "conserved," because it is the present state. Its changing configuration creates the effect of time. As well as temperature, pressure, color, sound, etc. Frequencies and amplitudes.

Consequently the energy goes past to future, while the patterns generated go future to past.

As consciousness goes past to future, while the thoughts and feelings generated go future to past.

We have the digestive, respiratory and circulatory systems processing the energy, while the central nervous system sorts through the forms. Logically making the mind the lens, filter and referee of our perceptions, rather than the source of the consciousness perceiving them.

As Emerson said; "We are but thickened light."

Galaxies are light radiating to infinity, while form coalesces to equilibrium. Both entropic.

So we exist somewhere between everything fading out and everything cancelling out.