Sitting in the back of a taxi on the way to the airport in Taiwan in 2009, already a few years into a period of heavy travel for work, I decided that I might as well use my brand new smartphone's camera to document what I was spending many cumulative days of my life staring at:  seatbacks. Since then, I have taken a photo of every seatback that I spent at least an hour behind -- mostly those on airplanes. They're all geotagged.