LumiWatch

how about a ui for your arm huh?

We present LumiWatch, a custom, tightly integrated and fully self-contained on-skin projection wristwatch. It incorporates a 15-lumen scanned-laser projector, a ten-element time-of-flight depth-sensing array, quad-core CPU running Android 5.1, and battery good for one hour of continuous projector operation (or one day of occasional use)

i'm including the link to the pdf for the work that this team of six at Carnegie Mellon University have put together, i'm always interested to see these things progress -- i believe the future of projected, projecting interfaces on to things will be massive in the years to come -- i'm certain these things are constantly being worked behind the scenes and that MIT has something equally as rad -- i was lucky ones to go to boston and was given a tour around the place which was super cool, they had a robocop style electric car with seethru plastic, super bad ass.