…Because the primary input method of the iPad is a single piece of multitouch glass, developers have incredible flexibility to design unique user interfaces. It’s hard to appreciate the variety of UIs though, since turning the screen off removes virtually all evidence of them. To spotlight these differences, I looked at the only fragments that remain from using an app: fingerprints.
My method involved cleaning the iPad’s surface with a microfiber cloth, using an app for a short amount of time, then turning the screen off. Next, I photographed the iPad, positioning a light source and some black matte board to limit distracting reflections. I then brought the photographs into Adobe Illustrator, and created vectors of the iPad and the fingerprints to emphasize the data.
via Design Language News.