In this third of a multi-paper series the discovery of a space dual for the laws of motion is reported and named the laws of
retention. This space-time duality in physics is found to inherently surface from a latency-information theory (LIT) that
is treated in the first two papers of this multi-paper series. A motion-coder and a retention-coder are fundamental
elements of a LIT's recognition-communication system. While a LIT's motion-coder addresses motion-time issues of
knowledge motion, a LIT's retention-coder addresses retention-space issues of knowledge retention. For the design of a
motion-coder, such as a modulation-antenna system, the laws of motion in physics are used while for the design of a
retention-coder, such as a write/read memory, the newly advanced laws of retention can be used. Furthermore, while the
laws of motion reflect a configuration of space certainty, the laws of retention reflect a passing of time uncertainty.
Since the retention duals of motion concepts are too many to cover in a single publication, the discussion will be
centered on the retention duals for Newton's Principia and the gravitational law, Coulomb's electrical law, Maxwell's
equations, Einstein's relativity theory, quantum mechanics, and the uncertainty principle. Furthermore the retention
duals will be illustrated with an uncharged and non-rotating black hole (UNBH). A UNBH is the retention dual of a
vacuum since the UNBH and vacuum offer, from a theoretical perspective, the least resistance to knowledge retention
and motion, respectively. Using this space-time duality insight it will be shown that the speed of light in a vacuum of
cM=2.9979 x 108 meters/sec has a retention dual, herein called the pace of dark in a UNBH of cR=6.1123 x 1063 secs/m3
where 'pace' refers to the expected retention-time per retention-space for the 'dark' knowledge residing in a black hole.