Underneath The In Side

What is it in the light In the air That is where it is But we aren't aware? What is it in the light I see When my mirrors reflect Yours back to me? What is it in the light From the moon's surface That makes our gravity Strong like this? What is it in the night That darkness gives no respect? It comes right in every pane One can never see it reflect What is it in the light That penetrates a shade Revealing imperfections That the darkness made? What is it in the light That makes the darkness hide? Maybe answers can be found Underneath an in side?