The more I look at it, the more it seems to me that things are to space what lumps are to pudding. Of course, there is even such a thing as pudding without lumps. Is that that fabled proof? ;P

In any case, the word "everything" is, no doubt, prone to (mis-)interpretation. Then again, pudding is observed, i.e. known. I mean, I could call pudding "the primary object" but it would be equally misleading as "everything" because such concept of observation already presupposes space-time. So, in the end, for me it really boils down more to where is space rather than what it is. Like, wtf is outside of universe-multiverse-whatever-verse? That is, also outside of all possible space-time configurations.