Stimulant’s XRay app essentially “relies on the ability of the Surface to detect where the phones are, communicating that position to tell them what to display and in what orientation.” Video after the break.
XRay, a mobile app from Stimulant (who earlier blended a Wii Balance Board with a Surface) that provides similar functionality; letting you effectively see secondary images on the touch-table.
[via Engadget]
