The document discusses the convergence of three areas: mobile augmented reality, out-of-home media strategy, and 3D mapping of the real world (mirror worlds). It argues that combining these areas could create campaigns greater than the sum of their parts. Specifically, it envisions using computer vision on mobile devices to accurately register virtual content in the real world by comparing a downloaded 3D map with the device's own 3D model generated from its camera view. This would allow more advanced location-based mobile augmented reality applications.