There’s now a tattoo that can control your phone

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. DuoSkin draws from
the aesthetics found in metallic jewelry-like temporary tattoos to create
on-skin devices which resemble jewelry. DuoSkin devices enable users to
control their mobile devices, display information, and store information on
their skin while serving as a statement of personal style. We believe that in the future, on-skin electronics will no longer be black-boxed and mystified; instead, they will converge towards the user friendliness, extensibility, and
aesthetics of body decorations, forming a DuoSkin integrated to the extent that it has seemingly disappeared.