Use your Nouse (Nose as Mouse)
Perceptual user interfaces (PUI) are systems that use users' motion – such as the motion of the face – to control a software program.
A technology developed by NRC-IIT, Nouse – which stands for "nose as mouse" – is based on tracking the rotation and scale invariant nose feature, defined as the closest point to the camera.
The main application of this technology is seen in designing intelligent hands-free perceptual user interfaces to supplement the conventional input devices such as mouse, joystick, track ball etc.