Answer:
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty.
A hole leading in, a hole leading out, we connect to a cavern that is slimy all throughout. What are we?
What breaks on the water but never on the land?
What goes in the water red, and comes out black?
Neither bought nor sold but more valuable than gold. It is built but not by hand. What is it?
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.