Arthur Conan Doyle 's Sherlock Holmes is also guilty of an unusual kind of cleverness. I remember reading this one story (whose name I forgot) where Sherlock essentially concludes that a person he's looking for is pretty intelligent just because the hat of the person is big and deep (after all, if the head is big, there's got to be more brains).
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> "It is a question of cubic capacity," said he; "a man with so large a brain must have something in it."
That’s from The Adventure of the Blue Carbuncle.
There are at least a couple of other examples of this line of thought in the books : https://www.ihearofsherlock.com/2011/03/skull-was-of-enormou...
That would be the Blue Diamond. https://targmne.files.wordpress.com/2012/04/thebluediamond_b...
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