Interactive Demo Shows How Two Reflections Make a Rotation
A developer has published an interactive web demo illustrating a core idea from geometric algebra: any rotation can be built by combining two reflections. Instead of relying on matrices or quaternions, the tool lets you drag reflection lines and watch how their combination produces a rotation in real time.
This concept underlies "rotors," an alternative to quaternions that's gained traction in graphics and robotics circles for being more intuitive and easier to generalize to higher dimensions. The demo doesn't ship new code you'd drop into a project, but it's a clear teaching aid for a topic that trips up a lot of programmers when they first encounter geometric algebra.
While understated (it only picked up a handful of points on HN), this kind of visual explainer fills a real gap: most rotor/geometric algebra resources are dense with notation and light on intuition.