What is the arena in which physical reality unfolds? (From Albert) That is what is at stake.
But EK will be questioning this approach.
1. Which is more fundamental?
Do they have different domains? Cope better with closely related cases?
2. Which objects represent space-time role?
EK: this is to be functionally determined (one of those controversial claims).
Contrast `functional kind’ with `compositional kind.’ We specify functional role and then look for what instantiates that role in the theory.