There is one that has a head without an eye, And there is one that has an eye without a head. You may find the answer if you try; And when all is said, Half the answer hangs upon a thread.
It has an eye in the middle of it, but as you see, it cannot see. It is dark and not far away. You don’t see it every day. It is not night and it is not bright. It can have twists and water and scares. What is it?
