Instead of relying on visual cues, the 'Touch It' watch by designer Lee Wonjae tells you the time through touch. Designed for the hearing impaired, the watches have rotating bumps that move instead of dials.
The watch works by placing a stretchable material over a minute and hour hand with raised embezzlement. As the contoured hands move throughout the day, so does their imprint on the material above.
Since the watches are circular, there also needs to be a way to orient the user. Notches and protrusions on the side of the watch lets the user know which side of the watch is up. Each notch is a different shape so you can differentiate which side is which without looking.