Answer:
In we go, out we go. All around and in a row. Always, always steady flow. When we'll stop, you'll never known. In we go, out we go.
Inside a great blue castle lives a shy young maid. She blushes in the morning and comes not out at night.
Not born, but from a Mother's body drawn. I hang until half of me is gone. I sleep in a cave until I grow old. Then valued for my hardened gold.
It is the electronic version of junk mail or a salty meat in a can.
What can be forever wound up but never annoyed?
What never gets any wetter no matter how hard it rains?