Zero UI refers to a paradigm where our movements, voice, glances, and even thoughts can all cause systems to respond to us through our environment. At its extreme, it implies a screen-less, invisible user interface where natural gestures trigger interactions, as if the user was communicating to another person. It is brought about by the emergence and eventual mainstream adoption of sensors, wearables, distributed computers, data analytics, connected everything, where anticipatory, adaptive and contextually aware systems provide what we want when we want it – “by magic” This presentation explores the contexts, scenarios, and uses of Zero UI, what it will mean to live alongside or even “inside” them. Zero UI will not be limited to personal devices but will extend to homes, entire cities, even environments and ecosystems, and as a result have a massive impact on society as a whole.