In movies such as A Beautiful Mind, a crazy / obsessed person will cover a wall with photographs and news articles, and connect them with colored yarn. (This is called link analysis). We've all seen this a bunch of times, but what was the first movie to use this trope?

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    – Paulie_D
    Commented Feb 27, 2019 at 7:51
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    Are you actually interested specifically in the first instance of a crazy/obsessed person doing this, or would examples where it is done by perfectly rational people just doing their jobs also count? Or are all police detectives and private eyes being classified as "obsessive" due to the nature of their work? Please note: I don't intend this comment to sound mean-spirited, I'm just not sure if the person's mental state is really part of the question you want answered.
    – Steve-O
    Commented Feb 27, 2019 at 15:15
  • @Steve-O I'm asking about a "crazy" person doing this as part of their obsession. (Good question! And I didn't take it as mean-spirited. ;-) ) Commented Feb 27, 2019 at 18:59


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