Answer:
It cannot be seen, cannot be felt, Cannot be heard, cannot be smelt. It lies behind stars and under hills And empty holes it fills. It comes first and follows after, Ends life, kills laughter.
Slayer of regrets, old and new, sought by many, found by few.
What goes further the slower it goes?
You can tumble in it, roll in it, burn it, animal eat it. Used to cover floors, still used beyond stall doors. Freshens whatever it is placed on. Absorbs whatever is poured into it.
What has a head, a tail, is brown, and has no legs?
As round as an apple. As deep as a cup. All the king's horses can't pull it up.