Answer:
What goes all around the world but never leaves its corner?
I am a word of letters three. Add two and fewer there will be. What word am I?
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.
Lovely and round I shine with pale light grown in the darkness a lady's delight.
Whoever made me doesn't want me. Whoever bought me doesn't need me. Whoever uses me doesn't know me. What am I?
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.