Shadow body mirror world

When I was lost in the light, I made my own dark, and it walked with me — my ageless shadow, my loyal replica.
And a replica of the world, held so close in this mirror. Give me a minute of solitude, and I will step into it, and my shadow and I will switch places.
I will become a stranger among you, a stranger even to myself, and who will know?
Only the shadow, only the mirror, only the locked door of my open eye.