"Push your face closer to the mirror, until your eyes can seemingly look into themselves (they include the other in their peripheral vision). Now focus on the world behind you, over your shoulder. What are you seeing? You are seeing the world behind you, while at the same time in the corner of your eye, you see your own eyes turned to the side. You see yourself looking. Now look back at your face. For a second, you see one eye, then your vision “snaps” to the “correct” focal length to see your face. Maybe your nose is so big, like mine, that it is somewhat out of focus if you look into your own eyes. Suddenly you see your familiar “2D” face is really in 3D. It’s disturbing, unusual, distancing. The sequence of focus on one thing, then on another, all the while knowing that you are looking at one continuous face (something that you usually don’t experience when looking at faces, this sequence of movement and focusing). You’ll feel a kind of vertigo, but remember, you’re right here, the actual 3D you, the whole time, looking into a mirror. If you felt some vertigo as you “moved and focused” back into your “true self,” that is the point.
We see ourselves and then we see a frame and then we see the wall and a ghostly image of our nose, and we see, out of the corner of our eye, someone (us?) in a flat surface on the wall, who also looks like we are looking down and to their (our?) right. It is difficult to explain, it is easier to just go over to a mirror and look."
-quoted from Jean Luc Heilegra, The Method and Being Notebooks Vol. 1