I recall reading an article a while back that talked about the shape of narratives and, possibly, specifically, choice-based narratives. It featured diagrams of how narratives expand and contract with visual diagram that I think were written in Twine. There were several different categories of different narratives.
I don’t know if it was a Narrascope presentation or a Twine tutorial or an Emily Short blog post, so I don’t know how to locate it. If anyone recognizes any of these elements and can direct me to the article, I would greatly appreciate it.