The Lost One
I never rejected 3D space time because it could not be visualized, where do you get that from? I can visualize 3D space time models easily, but I am saying it is a mental creation and the movement I see is happening in the now, what is called time, and which I call the endless now in this context of explaining why time as a real entity does not exist outside the mind.
But you cannot visualize 4D space?
The 4th being time. We are dealing with universe, so it does concern spacetime.
The question is why you keep trying to leave out "time"?