Included on the list of the 20 most-watched TED Talks to date is Pattie Maes' discussion and demonstration of the sixth sense. (No, we're not talking about dead people here.) 

Maes' lab at MIT, spearheaded by Pranav Mistry, developed the device referred to as SixthSense. The wearable prototype includes a camera, projector and cellphone and currently costs just $350 to build. The components are simple, easy to come across and affordable but the experience it allows consumers could pave the way for profound changes in the way we interact with our environments moving forward. 

For example, users of the device can access information such as the environmental sustainability of various products or make a phone call by touching buttons projected on your hand. To see how it works for yourself, take a look at the video below.