“I can never bring you to realise the importance of sleeves, the suggestiveness of thumbnails, or the great issues that may hang from a bootlace.” So says Sherlock Holmes to his sidekick in Arthur Conan Doyle’s story “A Case of Identity.” The detective is describing the method of minute observation for which he is so famous. By paying attention to the smallest details, he has just deduced with a single glance that a particular woman is a short-sighted typist who left home in a hurry after scribbling a letter.
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