Answer:
A shimmering field that reaches far. Yet it has no tracks, And is crossed without paths.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.
Round as an apple, deep as a cup, and all the kings' horses can't fill it up. What is it?
As I walked along the path I saw something with four fingers and one thumb, but it was not flesh, fish, bone or fowl.
Hold these between your knees if you want to set a Cuban beat.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?