Paper, one of the oldest information-display technologies, continues to have many advantages over even the most advanced video displays. It is lightweight, thin, and cheap; draws no power and never becomes incompatible with new technologies; can display higher-resolution images than any other medium; may last for centuries; and can be recycled. Video displays are heavy, expensive, draw power, and go to the landfill after a few years of use. Paper can be held at any distance from the body and examined at any angle of view, whereas video terminals require the user to sit at a desk and stare at a fixed distance, causing eyestrain and backstrain. The one great advantage of the video screen is that it can display an endless series of different texts and images. If a material could be developed which had the advantages of both...