Answer:
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
What I am filled, I can point the way. When I am empty. Nothing moves me. I have two skins. One without and one within.
The strangest creature you'll ever find has two eyes in front and a hundred behind.
Neither bought nor sold but more valuable than gold. It is built but not by hand. What is it?
What is put on a table, cut, but never eaten?
I can only be played on a windy day
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?