The company behind the Fitbit, NewDealDesign, has answered a conceptual design challenge with what it sees as the next step in wearable tech, Project Underskin. Online design website Co.Design, as part of a week focusing on wearable tech, asked NewDealDesign to imagine what the tech would look like when it reached "beyond the wrist." The resulting Project Underskin is a "smart digital tattoo," which would be implanted into your hand.