Answer:
Turns us on our backs, and open up our stomachs. You will be the wisest of men though at start a lummox.
My sides are firmly laced about, Yet nothing is withinΝΎ You'll think my head is strange indeed, Being nothing else but skin.
What goes in, but never through? I've got some and so do you. We might lend one, or even two, but only if our trust is true.
The more of it there is, the less you see.
When it comes in, From sea to shore, Twenty paces you'll see, No less, no more.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.