Answer:
What has one eye but cannot see?
Large as a mountain, small as a pea, Endlessly swimming in a water-less sea.
A little house full of meat, no door to go in and eat.
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.
What do angels sing in the shower?