Approximation of a Physarum (aka slime mold) transport network.
To learn more about this, read [this blog post](https://www.moll.dev/projects/physarum/) by Thomas Moll which helped a lot in getting started on this.
The original paper on which this is based on is titled "Pattern Formation and Evolution in Approximations of Physarum Transport Networks" by Jeff Jones and can be found [here](https://uwe-repository.worktribe.com/js/pdfjs/web/viewer.html?file=https://uwe-repository.worktribe.com/previewfile/980585/artl.2010.16.2.pdf).