What has a bell but isn't a church. Is full of air but is not a balloon?
It holds most knowledge that has ever been said.
But is not the brain, is not the head.
To feathers and their masters, it's both bane and boon.
One empty, and one full.
I mirror your actions. What am I?See answer
Select a pack of riddles and try to solve it in an interesting way.
This riddle appears in the following downloadable PDF files: