If you’re old enough to remember 1990, that’s the year MC Hammer released his signature, Grammy-nominated song “U Can’t Touch This.” Hammer may have looked great rapping in parachute pants but he wasn’t that great at prognosticating. Within 15 years people were indeed touching it . . . and they were about to touch it a whole lot more after 2007, once Apple released its groundbreaking iPhone, the first handheld device ever shipped with a multi-touch display. Today, the appetite for high-quality interactive displays has spawned a massive industry with sales by 2018 expected to reach $31.9 billion. Though the display-user interface is now ubiquitous and so intuitive that even infants seem to know how to swipe left and right, we sometimes forge