Answer:
I am so simple that I can only point. Yet I guide men all over the world.
When it is alive we sing, when it is dead we clap our hands. What is it?
It flies when it's on and floats coming off.
Runs smoother than any rhyme, loves to fall but cannot climb.
As round as an apple. As deep as a cup. All the king's horses can't pull it up.
I'm the source of all emotion but I'm caged in a white prison.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?