The kind of reality which underlies your experience can change from moment to moment as from dream to waking and back to dreaming. The reality is given and you do not question it, feel no need to do so, and yet to attain the ground of experience would be to have an unequivocal account of such changes, an effective theory of ignorance, as the one who escaped Plato's cave returns with a full knowledge of the mechanism of the shadow world. That this knowledge is in the form of a theory however is not enough, theories and theorisers themselves belong to a given reality. To be irreversible it needs to be a direct showing integral to a wholly different kind of knowing and experiencing.