Here's a fun project. Artist Kyle McDonald's "People Staring at Computers" photo collection features images of more than 1,000 faces, snapped as they gazed at Macs in New York Apple Stores. While looking at the images, it's fun to wonder just what the users were staring at, though it's impossible to tell. Some look delighted, while others seem perplexed and even concerned.
You'll also find a wide range of users, from young and old to customers and, in one case at least, an Apple Store employee. The whole thing reminds me of those