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We cannot say the same here in two quite different now(s).

Time also takes place in the natural equation – and not just the space.

Once said, the first «here» has gone, token by the flux of time.

That's why it is not logically legitimate to talk about a same here in two quite different moments.

Physical level is a complex of structures: the Earth; a body; an artifact (artificial fact) – and so on.

But none natural structure is permanently immutable. So each one is not a truly reality, but a passing one. It means that it is not a true structure – in an ontological meaning.

Everything, in Nature, is not quite static – and immutably static. All is consequence, movement, passage – and in a permanent way.

The mutability of the natural flux characterizes Nature, thus contradicting the ontological principles of the logical definitions which declares that the main condition to anything be truly real is to be always the same at not only two different times, but at ALL the times of its ETERNAL existence. And necessarily.

Every natural thing move itself through a domain of relation, or, even seeming to be static in a relational field (a referential, I mean), is animated or vivified with an inner movement of their parts (parcels). So, they are not immutably static in fact. Thus they are not absolute realities – just relatives. Apparent.

That  means that they are not quite true in an ontological way (ontological meaning), but being just appearances: illusions of reality.

When my house is that one just THERE in a today and tomorrow means the same, there is, in the sentence, the equivocation of a house that is not the same INDEED, as the times of the uttering were distinct. And the house, too (even a micro aspect of it has changed, nevertheless no one could sight it).

If a  time is not different from another one, but being equal and the same and at a same time in two quite different references (or relational structures, or circumstances), then we were talking about the same reality: an identity, we can say.

However, if the same reality is not in two different times as the quite same reality that it has to be, in order to be a true reality, or if it is rigorously the same in those two different times, it doesn't belong to the physical field. As in Nature nothing is the same from time to time!

That's why we cannot find a true reality in material Nature.

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[From my «Critical Analysis on Space and Time Structures Comparing Kantian and Scientific Empiricist Conceptions».]