Answer:
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
It's equally comfortable in an orchestra and a geometry textbook. What is it?
A nut cracker up in a tree.
What is never used unless it's in a tight place?
What types of words are these: madam, civic, eye, level?
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.