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“Electronic reusable paper is a display material that has many of the properties of paper.  It stores an image, is viewed in reflective light, has a wide viewing angle, is flexible, and is relatively inexpensive. Unlike conventional paper, however, it is electrically writeable and erasable. Although projected to cost somewhat more than a normal piece of paper, a sheet of electronic reusable paper could be re-used 1000s of times.  This material has many potential applications in the field of information display including digital books, low-power portable displays, wall-sized displays, and fold-up displays.” - http://www2.parc.com/hsl/projects/gyricon/