I wrote an SVG editor and physics simulation to determine how pieces connected by rigid rings will dangle when hung. I was surprised at how well the simulation actually predicted reality!
This was done with a lot of help from Gemini over last week (so half with the upgrade).
Main link is an explanatory article.
Here's the live app: https://jasonthorsness.github.io/tree-dangler/
And source: https://github.com/jasonthorsness/tree-dangler