fun

PostgreSQL internals visualised as a working 3D city: watch queries move through the engine like traffic. An independent educational prototype, openly flagged as early and reviewed, with a correction template for anyone who spots an inaccuracy. A playful companion to the Postgres survival guide.

The HN discussion is mostly delight (“I don’t know what I am looking at but it is fabulous”) plus useful feedback that the guided tour is too busy and should be interactive, and the tantalising idea of generating visualisations like this for whatever you’re currently learning.

A visualisation tool that replays coding-agent sessions on a 3D map of your codebase. Watching where the agent walked, file by file, is a novel angle on the understanding problem: not reading the diff, but seeing the journey that produced it.

Sam Rose hand-ported the core of Kubernetes to TypeScript so it runs entirely in the browser: pod lifecycle, cluster networking, DNS and deployment controllers, about 100,000 lines written with LLM assistance, every line reviewed, and 2,000-plus tests checked against a real k3s cluster. It ships at roughly 140KB gzipped and exists to power interactive Kubernetes tutorials. A nice data point for what one developer educator can now build with agents.

The HN discussion found the workflow more interesting than the artifact: the review discipline and testing against a real cluster is what separates it from vibe slop, with one commenter suggesting we’re on the cusp of only needing to read the tests. That, and the inevitable jokes about Kubernetes complexity.

A browsable queue of Wikipedia rabbit holes and evergreen YouTube videos that have been popular on Hacker News.