Natural Interaction is a type of interaction that follows an approach to human-computer interaction which uses the natural behaviors (movement, gesture, speech) of the user to interact or "communicate" with an application. The interaction interface is meant to be invisible, or become invisible through naturalized interaction (requiring limited learning for interaction), and based on nature or natural elements [Blake 2010]. Ideally, natural user interfaces are designed to use natural human behaviours to interact directly with content, and may be facilitated with devices such as multi-touch surfaces (iPad or PixelSense) or motion detection sensors (Wii or Kinect). Bill Buxton, a Principle Researcher for Microsoft and pioneer in human-computer interaction has suggested that an interface is truly natural when it "exploits skills that we have acquired through a lifetime of living in the world" [Buxton, Bill 2010]. It includes [Free-form gestural UI] and [Speech-based interaction]