Answer:
Very helpful if you intend to go gently down a river.
The part of the bird, that is not in the sky, Which can swim in the ocean and always stay dry. What is it?
Casper was a friendly one and Demi Moore made a clay pot with one.
I go around in circles, But always straight ahead Never complain, No matter where I am led.
The more you have of me, the less you see. Who am I?
What is always coming but never arrives?