Dynamically Changeable Physical Buttons

Physical buttons have the unique ability to provide low-attention and vision-free interactions through their intuitive tactile clues.
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Ink Calendar

The ink is absorbed slowly, and the numbers in the calendar are "printed" daily. One a day, they are filled with ink until the end of the month. A calendar self-updated, which enhances the perception of time passing and not only signaling it.
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Electronic Rule

Electronic Ruler is a concept design by Shay Shafranek
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