  We argue that the construction of spacetime is personal, specific to each
observer, and requires combining aspects of both discovery and creation. What
is usually referred to as the block universe then emerges by noting that part
of the future is contained in the present, but without the limitations that the
four-dimensional block universe usually implies, of a reality in which change
would be impossible. In our operational approach, reality remains dynamic, with
free choice playing a central role in its conceptualization. We therefore claim
that Einstein's relativity revolution has not been fully realized, since most
physicists do not seem to be open to the idea that objects move not only in
space, but also and especially in time, and more generally in spacetime, with
their rest mass being a measure of their kinetic time energy. When relativistic
motion is revisited as a genuine four-dimensional motion, it becomes possible
to reinterpret the parameter c associated with the coordinate speed of light,
which becomes the magnitude of the four-velocity of all material entities. We
also observe that the four-dimensional motion in Minkowski space can be better
understood if placed in the broader perspective of quantum mechanics, if
non-locality is interpreted as non-spatiality, thus indicating the existence of
an underlying non-spatial reality, the nature of which could be conceptual,
consistent with the conceptuality interpretation of quantum mechanics. This
hypothesis is reinforced by noting that when observers, or experiencers, as
they will be referred to in this article, are described by acknowledging their
cognitive nature, of entities moving in a semantic space, Minkowski metric
emerges in a natural way.
