DuoSkin is a tattoo like smart device that lets you interact with connected devices.

DuoSkin | MIT Media Lab

DuoSkin is a fabrication process that enables anyone to create customized functional devices that can be attached directly on their skin. Using gold metal leaf, a material that is cheap, skin-friendly, and robust for everyday wear, we demonstrate three types of on-skin interfaces: sensing touch input, displaying output, and wireless communication.

media.mit.edu

This is some cool tech that gives us yet another way to interact with our devices. Through different gestures I imagine it could be possible to send different commands to our devices through the stylized DuoSkin tech.