I initially made this to experiment with 'faking' depth of field in CSS (check out my penultimate tweet for the demo vid and inspiration from shuding_, link at the bottom of the site).
But last night I remembered that ThreeJS exists, so rewrote it using react-three-fiber. This was my first time playing around with it and I'm super impressed, it's incredibly ergonomic.
Edit: not documented, but right-click drag to pan