Answer:
What is the middle of water but is not an island?
An artΒ-form and its colourful result.
It goes up and down the stairs without moving.
What breaks in the water but never on land?
What never gets any wetter no matter how hard it rains?
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.