Answer:
What two things can always see what the other sees, but can never see each other?
Halo of water, tongue of wood. Skin of stone, long I've stood. My fingers short reach to the sky. Inside my heart men live and die.
What has wings, but can not fly. Is enclosed, but can outside also lie. Can open itself up, or close itself away. Is the place of kings and queens and doggerel of every means. What is it upon which I stand? Which can lead us to different lands.
When young, I am sweet in the sun. When middle-aged, I make you gay. When old, I am valued more than ever.
I bind it and it walks. I loose it and it stops.
What language does a billboard speak?