I like the thought about spacetime as the qualifier of physical reality for us.
We as conscious here-and-nows moving about in it, and spacetime qualifies what is the case of the matter.
Or something...
I wasn't looking for a specific response, it's more I wanted to present my findings - and the little alien on it's bike*! 
When coming across this thread quite a while ago, I did some looking and reading around and then posted something. But shortly later I noticed, I had gotten some things wrong and deleted it. Now I had some leisure and it took my fancy again and so I embarked on another fun voyage through the wonder of internet self-education. I love these things where physics becomes so fantastic and baffling that indeed it fits into the philosophy department!
Goes and tries to unknot her mind with a bit of meditative darts-throwing...
*Edit: it is really worth watching that little segment, even my husband, who's a mathematician said he wouldn't have seen it presented that well and how memorable it would be. I prefer BBC-style documentaries, but hey ho - they did that in a lovely way!
I think it's an adaptation of a graphic of our light-cone from the Hawkins book "Short Story of Time".
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