To celebrate Timex’s 150th anniversary, Timex and Core77 ran a contest to design a concept watch. In the year 2154, one would be able to tell the time simply by looking at one’s thumb. While this design is a runner-up in the event, the idea is pretty fresh.
The disposable device is designed to be clipped to the wearer's thumbnail. Pressing the tip of the nail would activate a luminescent time display.
[via: CNET] [winners] [nail watch]