When fitted with a pico-projector, the Skinput system could display an image of a digital keyboard on a person's forearm.

CNN: Microsoft's Skinput turns hands, arms into buttons

Trust us, the sharp and large picture you may hope for from this device is possible only in very limited circumstances -- even a moonlit night seems likely to mess with your enjoyment of the attached pico projector's output.

ENGADGET: LG eXpo projector hands-on Hands-on