A new technology currently under development, digital ink will theoretically make it possible to create electronic books that have the look and feel of today's dead tree versions. The concept involves using "pixels" that are actually magnetically-flippable capsules--black on one side, white on the other--that can be changed by electrical impulses. The technology is still in its infancy, and has only been used for things like window signs so far...but it is expected to be in general public use within several years at most.