Answer:
A man shot two arrows at its center and missed both times, but using a sword swung once at its center and hit it twice.
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
What is so fragile that saying its name breaks it?
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 has four legs during the day; and six or eight during the night?
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.