Living in a German city, my everyday life is supported and stabilized by sociotechnical systems. Just now, I have switched on a light because it is getting dark, while in front of my window a line of streetlights has switched on to illuminate the street. This morning as every morning, I went to the kitchen and poured myself a glass of tap water and drank it-without worrying about the water quality. If I had not been writing this essay, I probably would not have even appreciated that I have drinking water running into my kitchen sink, electricity supply built into my walls, and a city-wide lighting system out there that illuminates my street via radio ripple control. I have grown up like this, I am used to this. I take public lighting for granted and trust that public water services provide clean drinking water, also known as the "best-controlled product" in Germany (UBA, 2015, December 2). I also had little reason to mistrust these public services. The streets are well-illuminated and the tap water is looking clean, odorless and tastes fine.My attitude towards tap water and electric lighting can be best described as what cognitive scientists have termed "inattentional blindness" (cf. Zerubavel, 2015). I am not alone. In fact, the wide-spread blindness towards water supply systems and electrical lighting partly explains why they are often described as "invisible infrastructures" (Larkin, 2013) that have "sunk into the background" (Star & Ruhleder, 1996). Such infrastructures are extremely convenient to live with as long as they are properly maintained and work.However, the invisibility of public infrastructures can also be problematic, if not paradoxical, for three reasons. First, the creation of sociotechnical expert systems and successful delegation of these basic services leaves us dependent and helpless in the event of sociotechnical failure. When the lights go out, as famously described by historian David Nye (2010), we can only hope that they will come back again soon and meanwhile experience the blackout as a state of exception. If water supply systems fail, people are forced to find alternative water supplies and eventually develop their