Answer:
It cannot be seen, it weighs nothing, but when put into a barrel, it makes it lighter.
What surrounds the world, yet dwells within a thimble?
My first is in window but not in pane. My second's in road but not in lane. My third is in oval but not in round. My fourth is in hearing but not in sound. My whole is known as a sign of peace. And from noah's ark won quick release.
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
I wear a red robe, with staff in hand, and a stone in my throat.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.