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This might be interesting for visualizing 'nearby zettels' https://www.ayoa.com/ourblog/welcome-to-radial-maps-in-ayoa/
This being in a sort of "fractal-ish", zoom-able interface would be really cool - possibly as tree with leaves branching in specific directions
The same view using explicit tree: https://en.wikipedia.org/wiki/Radial_tree
^ came across that via https://treevis.net/#Boutin2005
For visualizations, perhaps checking out d3.js and pixi.js would be better than graphviz, as it's interactive and better UX