Artist Jon Kessler has built an interactive hovel that feeds back visitors information based on data they send using their own mobile devices, via the A/N blog:
The Web is an immersive installation that addresses the significance of the Internet and mobile devices in our lives while simultaneously examining the role of the viewer. The idea for the piece came to Jon Kessler on a New York subway ride when he realized that at least half of the riders were speaking on their cell phones, sending text messages, playing video games, or otherwise immersing themselves in their networked mobile devices.
…Upon entering the exhibition, visitors are invited to download an iPhone app that feeds their images in real time onto surrounding monitors. Kessler’s creation broadcasts collected data, targeting viewers with images of themselves, their experience, and ultimately enticing input and generating output.