How do I get Big out of the Underpant King's throne?

I'm stuck at the end of "Buried", where Big is sitting in the throne, throwing rocks at me.

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The radio once gave me a hint about elements and that I need to keep some and remove others, but I'm not sure what that means.

I've tried interacting with the big glowing towers surrounding Big, but to no avail.

How do I get Big?

tiny-and-big

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