Answer:
I am whole but incomplete. I have no eyes, yet I see. You can see, and see right through me. My largest part is one fourth of what I once was.
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
What wears a coat in the winter and pants in the summer?
What goes through the door without pinching itself? What sits on the stove without burning itself? What sits on the table and is not ashamed?
What can you throw but not catch?
What is so fragile that saying its name breaks it?
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?