It's safe to say that touchscreens have become a normal part of everyday modern life. The input method is so ubiquitous that it's even appearing on standard computer displays -- ones that have a keyboard and mouse within literal arm's reach. Perhaps the last frontier of the touchscreen, then, is being able to turn any surface into one, rather than having to buy a dedicated device that performs the function. A new invention by the Nanyang Technological University aims to do just that.