The core mystery challenging the main characters' beliefs is the realization that the Metal Monster and its components are not merely inert metal, but are 'ALIVE AND THINKING'[1]. This phenomenon is described as 'outside all experience, beyond all knowledge or dream of science,' particularly because these metal entities move 'consciously, thoughtfully, deliberately'[1].
The characters struggle to comprehend 'Metal with a brain!'[1], as it defies their understanding of organic and inorganic matter and the very definition of intelligence and sentience[1].
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