Answer:
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find.
With sharp edged wit and pointed poise. It can settle disputes without making a noise.
I can be written, I can be spoken, I can be exposed, I can be broken.
You use it between your head and your toes, the more it works the thinner it grows.
What can't you see, hear or feel, until its too late. What shadows love, and shopkeepers hate?
If lightning strikes an orchestra who is the one most likely to get hit?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?