How Pointer Pointer Uses Voronoi Regions and Canvas
Paul Irish · Explainer · 4 min · 2012 · YouTube title: pointerpointer.com's use of voronoi, canvas, and javascript
Why it's here
HN links it as the author's own breakdown of Pointer Pointer's inner workings.
What it covers
Paul Irish explains how pointerpointer.com works. It uses a hidden canvas of colored Voronoi regions to look up which photo matches the cursor position.