NewsFlash in operation (via MIT Media Lab)
Light we cannot see, or hardly see, can carry communications, this method is well practiced. However, two students at the MIT Media Lab (MML) are taking the concept to interfaces we have taken for granted, every digital screen. In a method akin to QR codes, screens will cast high-frequency red and green light in a few pixel columns along the vertical portions of the screen that any other device with a built in camera can detect. A specialized application on the camera based device will interpret the red/green signal and perform a task. They dubbed the tech "NewsFlash."
At the moment, the NewsFlash acts exactly like QR codes by directing the scan-device to a webpage. At the MML showcase for NewsFlash, iPads are used to display a news article. Users then scan the different iPads for redirection to the news article of choice. The "color codes" contain information beyond just an article link, such as language translation information.
Yes, this is simple wireless transmission. What NewsFlash has inadvertently accomplished is showing that unobtrusive, privacy maintaining, data communication is possible on mobile platforms. In other words, eliminating user device identification. I think anyone can appreciate a little privacy in the digital age.