interactive black hole by Opus 5.5

Hi all! Sharing a side project I made with Claude Code over the last couple of days: an interactive black hole on my site. [https://legost.in/en/utilities/black-hole](https://legost.in/en/utilities/black-hole) What it does: \- Every pixel traces a ray of light backwards through the spacetime of a spinning (Kerr) black hole. It runs on the GPU, using WebGPU compute where the browser has it and WebGL 2 otherwise. \- The accretion disk has Doppler and gravitational shifts, black-body colours and a hot spot on its orbit. Behind it is the real Milky Way and a real star catalogue, lensed. \- There's a "fall in" button: the camera drops through the event horizon and looks back at the universe it's leaving. \- A short tour, plus an article with the actual formulas and a list of what's simplified.