All these ways of pretending that you are permitted to mean something in speaking of awareness of awareness. If you are aware of it then it isn't awareness but at best some sort of parallax fringe you've hypnotised yourself into perceiving at the edge of things. In other words it is a verbal formula that invents some addition to ordinary mind. It is the same if you think of the 'space' in which all experience 'takes place'. This is admittedly an idea rich in destructive potential: all of experienced space, its contents and their causal and topological relations immediately dissolves in it, as does time, all boundaries, changes, differences ... and then itself disappears so that nothing is left, or the absence of absence (of which presence is a special case) - at which point some fool starts talking about experience 'arising' in it, as if arising were too not long gone. Perhaps it is enough to point to it as the unsullied - no matter the fetid quality of the consciousness, this emptiness stays pristine, unclouded. The worst pain or the greatest joy are indistinguishable - no wonder it seems to wear an enigmatic smile.