Sixth Sense technology allows users to seamlessly link the digital world to the physical world through natural hand gestures. It consists of a mini-projector, camera, and mobile device that together project digital information onto surfaces and physical objects. Users can interact with this information by making hand gestures that are captured by the camera and interpreted as commands. Some examples of uses include drawing, taking photos, checking product information, reading books, and making phone calls - all through intuitive hand motions. The current prototype can be built for around $350 and works with smartphones, with the goal of eliminating separate hardware devices altogether.