Well, that rotating thing is a clock/torture device, so nothing there.
As for the glow, I think it just happens. Sort of like how the wormspore sometimes just glows
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How do you know? Why put it as a centre piece? Just because they said obscurely for like a second on the stream doesn't mean it can't be something more, also why do some light up and some don't? I've added screenshots to the thread check them out.
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I can never be too sure, you're right about that. I just kinda feel they should've given us a bigger hint by now. I'll keep looking though :)