How to fake Boolean operation?

How this guy did that?

PS: Note the last comment from a guy: “Are you sure you used (generate) mesh distance fields? This can be done with “DistanceField_Sphere” node and invert nrm on the moving sphere”.

So doesn’t matter if he typed wrong, how this is done?

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Link to reference: https://twitter.com/t_looman/status/835201841877168128?lang=en

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That’s a good question, it seems like an interesting technique!