Conceived 12 months ago and designed over the course of 6 months, the Cicret Bracelet is a small wristband that looks similar to the Jawbone Up:

The Bracelet comprises a pico projector and a row of eight proximity sensors that point towards the user's forearm. It operates as a standalone device and, when activated with a twist of the wrist, projects an Android interface onto the users arm, much like Chris Harrison's Skinput research. The proximity sensors detect where the user's finger or fingers are and allow them to interact with the interface as they would any other Android device.

There are potential advantages to turning ordinary objects (or, in this case, limbs) into mobile devices, but projected touch screens typically lack the responsiveness and visual clarity of the glass screens we're used to. This projected keyboard, for example, delivered a poor typing experience.

It should be interesting to see if the Cicret Bracelet can improve on the technology, to make something we'd actually want to use.