third video down: Helicopter Taxi, is awesome. At first I thought the idea of a "digital toy" that's so close to a physical one—but just on an iPhone screen—was whack. But after watching the video my mind is spinning the storytelling possibilities of simple augmented reality.

Glasses were built to allow the user to see this 'hidden world' using a consumer Head-Mounted Display with an attached webcam. Video processing software was written to track printed markers, and to use those as a reference to bring a 3D object into the scene with correct positioning and rotation.