Answer:
Round like a dishpan and smaller than a bathtub. But the ocean can't fill it. What is it?
Although my cow is dead, I still beat herΒ What a racket she makes.
What has a spot and is very bright, is sometimes, red, white, blue, yellow or green and is often blinding.
What I am filled, I can point the way. When I am empty. Nothing moves me. I have two skins. One without and one within.
Put into a pit, locked beneath a grate, guarded through the night, yet it still goes out.
It is something you make after you've weighed your options.