The foreground complex of experiencing seems to be strongly invested in certain metaphysical principles, by being ready to defend them as if its own integrity depended on these as its foundational structures etc. But this level of awareness has no ability in itself to think metaphysically so it must delegate such matters to the background awareness. It relies on this senior tranche without looking too closely into it. The background assumptions can change substantially without the change registering in the foreground, and so much so that all of its vaunted metaphysical assumptions can be dissolved without any apparent change in the relationship. The very shallowness of the foreground is its greatest blessing. One fine day you wake up and notice that there's nothing there behind behind your 'I's.