\/\/iFi is an interactive artwork about (digital) human presence in our society. After connecting to one of the available \/\/iFi hotspots, visitors at Upstream Gallery are confronted with a visualization of all devices located in and around the building. The hidden waves generated by our digital behavior and movement through the gallery are exposed, making visible both how we are tracked through our movement, smartphone signals and usage, as well as the amount of data and analytics that we unconsciously and continuously build around us.