File this art project under things that are creepy but interesting. Kyle MacDonald created an app that snapped photos of people who were using computers in Apple's retail locations in New York, and uploaded them to his site. He logically called the project, People Staring at Computers. Here he explains in a little more depth:
I wrote a simple application that took one picture every minute. If it found a face, it uploaded the photo to my server. I installed the app around NYC over three days, collecting more than a thousand photos. Before sharing the photos online, I decided to exhibit them in the same places they were originally captured.
So I wrote another app that could be remotely triggered after being installed on all the computers in one location. When the app starts up, it takes a picture and slowly fades in that photo. A moment later, it starts cycling through older photos.