Suggested:
Most of us have a mental model of how we move through time. We can imagine a long tube that we are moving forward through, and we move through this tube at a constant speed.
Note: Relativity shows that we don’t move through time at a constant rate. We do however move through spacetime at exactly the speed of light. Anyways, this isn’t meant to be scientific.
I noticed that intuitively we think of time as a horizontal tube. And we move through it like a car that has cruise control set.
However, this perspective always made me feel like something is pushing us through time. Like a car needs an engine, there is something unseen that is propelling us forward.
I would like to offer a different perspective. Simply by rotating how we look at things, we can imagine the 4th dimension of time as pointing down, instead of forward:
We can now imagine ourselves falling through time.
A skydiver eventually reaches a maximum speed when the pull of gravity is equal to the air resistance pushing back. This is their terminal velocity.
We may be falling due to some kind of time gravity, and be hitting some time air particles that pushes us back, causes an equilibrium at our rate of time. The rate at which clocks tick is our time velocity. It can vary due to the density of time air.
Now all we need to do is figure what this time air is, and build a time helicopter than can generate time lift, and we will be able to fly to the past!