Answer:
What always goes to bed with its shoes on?
I am bought by the yard but worn by the foot. What am I?
A single syllable do I claim black was my most famous name; Fetal to mortals here below thousands have I slain in a single blow.
I turn everything around but I cannot move. When you see me you see you!
I am whole but incomplete. I have no eyes, yet I see. My largest part is one fourth of what I once was. What am I?
The answer I give is yes, but what I mean is no. What was the question?