Answer:
What is given but kept by the giver?
Walk on the living, they don’t even mumble. Walk on the dead, they mutter and grumble
What measures out time. Until in time all is smashed to it?
Crooked as a rainbow, and slick as a plate, Ten thousand horses can't pull it straight.
This is in a realm of true and in a realm false, but you experience me as you turn and toss.
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.