Answer:
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.
I am the place to turn to when nature calls. What am I?
What gets sharper the more you use it?
What is put on a table cut but never eaten?
What is easy to get into but hard to get out of?
I flow from the Homerβs mouth when he sees doughnuts.