Pico projectors are an easy way to increase the screen real estate of your mobile phone, but what if you'd rather not carry one around in your pocket or bulk up your phone's slim profile with a slip on solution? Well, a team of intrepid researchers may have come up with an elegant solution to your problem that can work with any smartphone and external display: virtual projection. The system works by using a central server that constantly takes screenshots of the external display and compares them with the images from the phone's camera to track its location. It then replicates what's on the handset's screen, while allowing you to add multiple image windows and position and rotate them as you see fit. Additionally, multiple users can collaborate and virtually project pictures or videos onscreen at the same time. Intrigued? See it in action for yourself in the video after the break.