Answer:
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.
I'm white, I'm round, but not always around. Sometimes you see me, sometimes you don't.
What has four wings but cannot fly and uses the wind but does not know why?
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.
It is able to speak because it has a hard gone. You know what it is as soon as it has sung. What is it?
People take me on walks and I run and have fun. What am I?