Answer:
Mouth up it gets filled, mouth down it gets empty.
Blind but cruel.
Inside a burning house, this thing is best to make. And best to make it quickly, before the fire's too much to take.
What can you hold in your left hand but can never hold in your right hand?
A tower at the root of all confusion.
I'm the source of all emotion but I'm caged in a white prison.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?