As a megaphone, the camera captures the movement of the camera as it moves across the screen. The camera also captures the effect of the light on the surface of the screen as it travels across the surface.
The effect is similar to that of moving from one part of a city to the other, or from one person to another. As the camera moves through the landscape, it creates a 360-degree view of the city at the same time. The result is a virtual tour of the entire city at one time, or two.