Researchers have developed a way to harness ambient electromagnetic radiation and use it to turn any wall into a touch sensitive surface.
The team, from Microsoft and the University of Washington, have demonstrated that when a person touches a wall with electrical wiring behind it, their body can be used as an antenna. This electrical signal can be gathered and interpreted by a device on the body, which can translate the gesture into a command.
At the present, the researchers have only demonstrated that the body can turn the electromagnetic noise into a usable signal. The next steps involve making the device smaller and more user friendly.