Answer:
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 boonΒ One empty, and one full.
I am the hole in the night, the ever watchful eye. I return in a cycle, to enlighten the sky.
Come up and let us go. Go down and here we stay.
I can move even when you are still. I can be one or many.
Hoofed frolicking.
What covers its face with its hands, speaks no language, yet most known what it's saying?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?