Since the invention of the computer, researchers, engineers, artists, and designers have invented and refined many ways to facilitate human interaction with the computer, such as manipulation of peripheral devices, motion and gesture tracking, voice commands, speech-to-text, and even brain-computer interfaces. Through it all the humble keyboard remains the principal human-computer interface, dominated in form by the conventional, flat, diagonal array of keys that come with computers, laptops, and accessed virtually on mobile device screens. These conventional keyboards are not optimized to accommodate the ergodynamics of the human hand or upper body. Less conventional physical keyboard designs reposition the keys or are shaped in ways intended to reduce the strain of repetitive typing. For example, some keyboards are split into left- and right-hand sides and angled to reduce bending of the wrists, are rounded to conform to the shape of the hand, position high-access keys in the middle for easy reach by the thumbs, and arrange keys into perpendicular rows and columns to reduce diagonal finger movements. Some also permit a choice of key switches, whose force–displacement characteristics can impact strain and fatigue. The Kinesis Advantage and the Ergodox are two examples of commercial keyboard designs that also permit remapping of characters to individual keys, and therefore enable completely customizable keyboard layouts.
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