Flexible keyboard. Use capactive plates, or spectra symbol’s force sensitive resistors. That way, there would be no non-flexible components. The keyboard could then be stuck to non-traditional or non-flat surfaces to act as an input device. As some others have mentioned, one idea could be a wristwatch with buttons all around it. A soft pot could also be used. Slide your finger around your watch to activate different functions or adjust the time. For something that could be used in a variety of projects, I would suggest a flexible version of the capacitive number pad.
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