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.
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
Hoofed frolicking.
You can spin, wheel and twist. But this thing can turn without moving.
What is it that has four legs, one head, and a foot?
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?