[He gives her a gentle tap on the back of the head--]

You're over-thinking it. Let's take the mirror out of the equation.

["Faust" was a kind, but strict teacher. His voice remains soft and calm, being patient as he leads her in the right direction.]

Picture yourself alone in the room, with only just enough light present for your eyes to make out the shapes of the walls in the darkness. Imagine every corner of that room, seeing the way it slowly pulls together. You lift a strand of your hair -- and see how it slowly comes into view as your eyes adjust further.