Developer Joe Olsen, whose company Phenomblue writes applications for the Surface, said he had been told the second generation of Microsoft's Surface computing device was still in the development stage, and is two to three years away. Dubbed Second Light, the Surface 2 will build on the original model and have a second projector inside the table computer that can project images onto a layer above the surface of the screen.

In effect, the device will be able to overlay secondary images above those on the screen - such as satellite imagery over a street map, or more detailed contextual data on top of images.

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