HOW THE SPACETIME DIAGRAM ILLUSTRATES
THE FAILURE OF MINKOWSKI SPACETIME

This post is to demonstrate how the spacetime
diagram can be used to show that the Minkowski
spacetime it illustrates cannot exist in reality as
a real spacetime.

The two dimensional spacetime diagram represents
a 4-dimensional spacetime, with one spatial axis,
in the direction of relative motion, representing the
3 spatial axes and the other representing the time axis.