Reality bites.

Now let's suppose we're moving at c and start decelerating. What would happen then?

• Space and time dimensions appear: Decelerating from c to any other speed will change our experience dramatically: Going at c, we were unaware that the rest of the universe existed (although the rest of the universe is what allowed our pointlike experience to exist). Now, as we reduce speed, the universe will unfold upon us and start interacting. Our pointlike experience will expand into a 3D network of interactions, evolving around us. So space and time dimensions emerge from the ability to relate the interactions we can perceive now we move below c.
• Causality develops: As we reduce speed, we are not limited to feel everything in a single event or interaction, and we start collecting different entities that are able to reach us. We get the concepts of time and causality by arranging similar, periodic or frequent events that happen to us while we traverse our lifespan below c.
• Laws of physics emerge: Although the exchanges that pop up into our new reality are different ones each time, they keep a remarkable consistency. This recurrence (both in space and time) is what defines the rules for the evolution (the physical laws) for the universe we can perceive now we move below c.
• Distances and intervals unfold: Space expands and time slows down as we reduce speed, because we go from feeling everything instantly to having to collect events bit by bit while traversing a stretching path in space.

The similarities of this perspective (decelerating from relativistic speeds) with the inflationary era after the Big-Bang and the current accelerating expansion of the universe are tantalizing...