The augmented reality interface in Minority Report was futuristic, but what it lacked were objects that you could physically touch, according to researchers from Queens University. The problem is that the film's virtual interface floats in mid-air, and physical objects tend to be ground-bound. To get around that, the team developed a system called BitDrones, with flying nano-drones serving several functions. "PixelDrones" have a basic LED display to show information, "ShapeDrones" are cubic objects that form a physical 3D "display," and "DisplayDrones" contain a touchscreen interface. All of them, plus the human operator, are tracked with a 3D motion capture system.