Answer:
They're up near the sky, on something very tall. Sometimes they die, only then do they fall.
In the night a mountain, in the morning a meadow.
Runs smoother than any rhyme, loves to fall but cannot climb!
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.
It is worldwide, but once only a spider could weave one
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.