Answer:
I am lighter than air, but a hundred people cannot lift me. Careful, I am fragile. What am I?
The more of me there is the less you see.
I am a shimmering field that reaches far. Yet I have no tracks and am crossed without paths.
At night I come without being fetched, and by day I am lost without being stolen. What am I?
I start in little but I end in full you'll find me in half and complete.
A little house full of meat, no door to go in and eat.