In Torino today for the Frontiers of Interaction conference where I've just given a talk entitled "Digital Yet Invisible: Making Ambient Informatics More Explicit to People". Slides can be found here. The talk was about the paradoxical relationship between visibility and ubiquitous computing, a topic I already tackled in Paris few months ago:

"To some extent, the “disappearing computing” paradigm that Mark Weiser described has been some taken to the letter that digitality services are invisible. There is a very intriguing and recursive tension here that can be summarized by this dilemma: “how to make visible invisible techniques that aim at making visible the invisible“. And what often happens is that this lead to a situation where people think technology works like magic."

Thanks Leandro for the invitation! The video is available here.