Answer:
What can you fold but not crease?
I am the hole in the night, the ever watchful eye. I return in a cycle, to enlighten the sky.
You need a key to receive an answer from me. The answer you'll find is straight from your mind. What is it?
I'm tall in the morning and short in the noon. I disappear at night but I will be back soon.
Although my cow is dead, I still beat herΒ What a racket she makes.
I can only be played on a windy day