One of the things that is purely given is the landscape of priorities, or perhaps more accurately the landscape of meta-priotities behind that. Every kind of situational awareness is tacitly structured by the priorities, in the sense both of importance and of what order things should be dealt with, of its contents. The acceptance of these is automatic in order to be in the play, and even if a contrarian will wishes to reverse some of them or to reinvent them all, the prioritising principles must still be accepted. All the world-building that you do is based on these and while you are responsible for the former you are not for the latter. Because they are 'given' they can change in a beat, which is why transitions to other worlds can be so rapid and without disruption. It's not that the scene suddenly changes but that the hidden cues change and you instantly build the new scene in the blink of an eye.