Answer:
I am lighter than air, but a hundred people cannot lift me. Careful, I am fragile. What am I?
Break me and I am better immediately set and harder to be broken again.
The shorter I am, the bigger I am. What am I?
I am whole but incomplete. I have no eyes yet I see. You can see and see right through me. My largest part is one fourth of what I once was.
I am a shimmering field that reaches far. Yet I have no tracks and am crossed without paths. What am I?
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.