The MIT Media Lab has teamed up with Microsoft Research to create temporary tattoos that can control your smartphone. This latest piece of wearable technology, called DuoSkin, draws from the trend of temporary metallic body art and transforms it into a functioning piece of tech. They’ve created three different variations of the tech so far. The first acts as a track pad for your device (computer or phone), the second changes colour whilst on your skin depending on your mood, and the last piece acts as an NFC tag. Similar to traditional temporary tattoos, these tattoos are easily applied and removed from the skin using only water.