you shouldn’t draw too many conclusions from how it seems conceptually possible, in the mind of some specific conceiver, to separate the hand from its constituent elements of fingers, thumb, and palm. Conceptual possibility is not the same as logical possibility or physical possibility. It is conceptually possible to you that 235,757 is prime, because you don’t know any better. But it isn’t logically possible that 235,757 is prime; if you were logically omniscient, 235,757 would be obviously composite (and you would know the factors). That’s why we have the notion of impossible possible
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