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I'd like to notice an important thing: with this keyboard, one does not move the fingertips at all. The only motion required is press / release.

This is a great quality when hands are busy with something else, like holding a bike's handlebar, or an aircraft control rod.

It's also likely a good setup for some smart glove type of input device, where there are no keys to press but finger motions are detected.

If fingertips are allowed to change the position, a few more keys allow for easier chords and much more characters, all using the same 5 fingers. They can be touch-typed even easier than a normal keyboard.

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