Answer:
Thousands lay up gold within this house, But no man made it. Spears past counting guard this house, But no man wards it.
I move without wings, Between silken string, I leave as you find, My substance behind.
I scribble forms of the finest letter, And repel elements of the harshest weather. I am an arrow-aimer and a dust-breaker.
What kind of nut is empty at the center and has no shell.
What is it that has four legs, one head, and a foot?
It rows quickly with four oars but never comes out from under his own roof. What is it?