Answer:
I am all around, yet to me you are half blind. Sunlight makes me invisible and difficult to find. What am I?
I have a head tail but no arms and legs.
The more holes you cover the lower I go.
You use me between your head and your toes the more I work the thinner I grow.
I cannot be burned in fire or drowned in water. What am I?
What an fill a room but takes up no space?