Answer:
Who plays when he works and works when he plays?
What time of day, when written in capital letters, is the same forwards, backwards, and upside down?
What has a ring but no fingers?
Before Mount Everest was discovered, what was the highest mountain on Earth?
A canvas full of stars.
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.