Experience isn't just a stream of structured qualia, of noemata, there is also a noetic stream without which, naturally, there wouldn't be anything at all (Is there anything at all? Open question.) Since it can't be known then what sort of presence could it have? A sort of negative 'perception' of the 'I'-shaped hole in the middle of experience. You can only speak of it in indirectly evocative terms. Does it change in size? Yes. Does it have a 'fringe'? Yes, very radiant and colourful - time and space, all the grounding categories stream out of it. Is there a feeling tone? Yes, a quite delicious one, literally lovely, even though it is a black hole of the blackest kind. Does it seem to be located somewhere in the body? Yes, most certainly around the (metaphysical) heart, in the centre of the chest.