It can get confusing, trying to remember which keys are used for which
shortcuts in which programs. That's why Australian startup Sonder Design
developed the Sonder keyboard. Utilizing e-ink technology, all of its
letter, number and function keys can change appearance and function,
depending on the application being used.
British company Pi Supply has created a low-power, low-cost e-ink display module for the Raspberry Pi do-it-yourself single-board computer. PaPiRus, as it's called, comes in three interchangeable screen sizes (1.44, 2.0, or 2.7 in), and like all e-paper devices it's readable in sunlight and it remains on (which is to say it can display a static image) for a very long time without power. Its creators note that it is particularly well suited to data-logging applications and outdoor displays.