The reflective difference, that between say, experiencing and (the experience of) knowing that you are experiencing could be seen as a version of the ontological difference between being and the being of beings, and altogether as one of the family of motivations for he unfolding of phenomena within metaphysics. Thus, on the one side it is a difference which holds a strong charge which as force or desire sets things into motion, including a self-referential motion tending to ramification and complexity, and on the other is founded on a certain acceptance of thing-hood, of the frame of possible realities which must remain unquestioned. At the very least notice how this distinction is dissolved somewhat in sleep and dreams and clicks into auto-focus the moment you awake. You cannot point to it, only gesture in the gentlest way towards it.