Digital Tattoo Interface

Her cell phone is ringing, but the display is turned off. She lightly pushes a small dot on the skin on her left forearm to suddenly reveal a two by four inch tattoo with the image of the cell phone’s digital display, directly in the skin of her arm. She answers the call by pushing a tattooed button on her arm. While she’s talking, the tattoo comes to life as a digital video of the caller. When she finishes, the tattoo disappears.

Source http://www.core77.com/competitions/GreenerGadgets/projects/4673/