Mirror (Short but Challenging)

I walk alone everyday
Through rubble alleys
And abandoned streets
I stared at none ahead
Nor none behind my back
I heard only rushing cars
Not trees nor singing birds

Yet one early morning on
I stepped unto the streets
No soul breathed but one
She stood in black and white
Peering at an empty store
I approach her with dead sound
Tapped her like a child
She spun around gracefully
And I saw my face in front

*Explain how you understand this. Philosophy...