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This is such a joy to watch ... 5 minutes well spent; thank you!

That's a fun bit. Someone did this with sentiment analysis on texts and clustering. They looked at how sentiment changed during the book (the curve) and then they clustered them to identify 6-12 archetypical story "curves".

Source? That sounds interesting. I did my graduate work in a related field but never came across that. May have been before that of course...

He might be referring to this: https://arxiv.org/pdf/1606.07772v2.pdf

There's a link to it from the actual article.

Looks like exactly what I'm talking about. The paper I'm thinking of used a self-organizing map (SOM) for comparing arcs, if I recall correctly.

text version: https://www.laphamsquarterly.org/arts-letters/blackboard