It's about a mental activity while people look at a mirror and watch themselves inside the frame. I think these activities could separate to three stages: First is "see myself in the mirror, and notice difference between people and me." second is "see myself from other people's eye" third is "see the image of myself in other people's eye which come from the mirror." we build some unreal images of ourselves while interact with this world.and getting unsatisfied or narcissism through that image. Just like seeing the mirror. *Idea from Jacques-Marie-Émile Lacan's theory