Well, i believe the big white ball is a vessel for the actual Traveler that resides within. Just like how i think the Triangle ships are vessels for the Deep.
As for what the Traveler itself is? Honestly i believe it's a God. As in an omnipotent (or at least near omnipotent) God that represents life and creation.
I honestly believe the Deep and the Traveler were born at the dawn of existence, and the Traveler created the universe (or universes).
English
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So the ball is like its ship?
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Yeah, like a ship or a body.
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That's a cool theory my dude, the traveler and the darkness do feel pretty ancient, so perhaps they are from the dawn of time.