Answer:
What is as big as you are and yet does not weight anything?
I'm the source of all emotion, but I'm caged in a white prison.
In marble halls as white as milk, lined with a skin as soft as silk. Within a fountain crystal-clear. A golden apple doth appear. No doors there are to this stronghold, yet thieves break in and steal the gold.
It comes only before, it comes only after. Rises only in darkness, but rises only in light. It is always the same, but is yet always different.
To cross the water I'm the way, for water I'm above. I touch it not and, truth to say, I neither swim nor move.
I can only be played on a windy day
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What am I?