Answer:
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. What am I?
I am an instrument capable of making numerous sounds but cannot be touched or seen. What am I?
I’m tall when I’m young. I’m short when I’m old. I can light up your world. What am I?
I sit in a corner while travelling around the world.
I wiggle and cannot see; sometimes underground and sometimes on a tree. I really don't want to be on a hook and I become a person when combined with “book”.
The answer I give is yes, but what I mean is no. What was the question?