A Microsoft employee suffering from myoclonus-dystonia—a condition where the misfiring of the brain causes uncontrollable muscle spasms—discovered that she could regain control during a spasm by looking at her partner’s feet rather than her own. And that’s how she got her great idea: Why not use the HoloLens to retrain the brain and get it to act differently? To that end, she recruited the Microsoft Hackathon team to put the idea to the test.