  In an apparently unexplored region of relativistic spacetime, a simple
thought experiment demonstrates that conjoined Lorentz transformations predict
a proper clock at rest will run backwards and that prediction violates the
logical principle of causality. Shown first in a modification of the standard
clock paradox thought experiment, this fault carries over to finite
accelerations of the moving observer. After re-examination of the standard
clock paradox, a logical fault was also found in the concept of spacetime. A
two-dimensional treatment of the Earth orbit predicts that our astronomers
should measure proper time on distant variable objects in our own Galaxy as
impossibly running backwards on approach-then-recede trajectories. The
excellent record of relativity aside, we still have much new physics to learn
about our spatially three-dimensional universe. It is suggested that space is
not a freely stretching medium but is something that is substantive and is
being produced.
