The crazy wall trope is so common as to be cliche. You’re probably nodding right now in recognition, remembering some TV show or movie where papers tacked onto a wall and connected with a web of string is a visual cue that the main character is losing their marbles. The image is so pervasive that this website has been posting examples for 6 years. What I’m wondering is if this is actually a thing that people actually do. Certainly people put things up on walls to help them visualize a problem or see a pattern, but I wouldn’t necessarily call those “crazy walls.” Does it become crazy when they start using string? When the papers become jumbled? Even if they do exist in the real world, they can’t possibly be as prevalent as they are in the movies.