Answer:
I am all around yet to me you are half blind. Sunlight makes me invisible and difficult to find.
As a state in the USA, I am round on both sides and high in the middle. What am I?
What has a head and a tail but no body?
I am used for light yet I am solid. Without me you would feel enclosed. I hate being touched especially with a lot of force. I like to be in buildings.
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.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.