Answer:
They come out at night without being called, and are lost in the day without being stolen. What are they?
Cold head and feet; Round as a ball; Always turning around itself.
When will water stop running down hill?
They are Dark, and always on the run. without the sun, would be none!
They can be long or short; they can be grown or bought; they can be painted or left bare; they can be round or square.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.