We’ve all heard this term: GUI – Graphical User Interface. But with products like the Xbox Kinect we’re seeing user interfaces develop beyond graphics and into…kinetics. Trend forecasters see this as the next stage of human interaction with technology, it’s rapidly becoming more natural, and more human. Hence the term, NUI – Natural User Interface.  In simple terms, NUI is concerned with making technology much more natural to interact with. That may be through voice control of a TV (rather than fumbling with remotes and on screen menus), it may be through playing a video game just using your body with no need to master a controller of any kind, or it may be logging in to a system by simply having the system recognize you.
 
Just another example of how design is moving from graphics to complex interactions for  technology to feel more natural.

via PSFK: