Conversing with my shadow

I mocked at my shadow, "you don't have a face to show!"
He laughed at me and said, "better than wearing a thousand everchanging faces!"
I retorted, "your life is so fleeting,
let's see when the lights fade away!"
He quipped, "hiding from the grinning night while
waiting for the dawn, the story of your life!"
I went acerbic, "tell me, is there any purpose to your life?"
He smiled gently, "day and night your body obstructs this wondrous light,
and still I follow you without putting up a fight.
Doesn't that make me your only true friend?"

(Whether my latest poem (or prose poem, rather!) is good or bad, I feel good!)