Answer:
Flat as a leaf, round as a ring. Has two eyes, can't see a thing.
A house full, a yard full, a chimney full, no one can get a spoonful.
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 boonย One empty, and one full.
A hill full, a hole fullอพ yet you cannot catch a bowl full. What is it?
How far will a blind dog walk into a forest?
People take me on walks and I run and have fun. What am I?