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By equivalence, I mean that matter can be turned into energy (according to the equation) Like converting US Dollars into Hungarian Forints, one may be worth a lot more than the other, but they are both equivalent in that they can be used to buy stuff and can be freely converted back and forth (less commision of course)
The idea that space is not just a location is also what I'm trying to get at - because for space to have ANY meaning, it must contain matter or energy (because the only way to define space-time is in terms of matter or energy - e.g. in your xyz-t example, how do you define point 000-0?).
Perhaps it is no coincidence, and that space, time, matter and energy are all different variations of the same thing. That they are all different manifestations of the fabric of the universe - whatever that is.
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