To sound off the top of each hour, Alessandro Zambelli's DINN clock does't use a complex geared mechanism like a grandfather clock, or even simple electronics like your digital watch. Instead, positioned at the DINN's twelve o'clock is a tiny bell that's struck by the hour hand every time it passes.

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But a shiny bell and a pair of black hands are the only design cues you'll find on Zambelli's stark timekeeper. You'll have to guesstimate the time of day if you're not familiar with an analog clock face, and since it was created for Diamantini & Domeniconi—who are known for their catalog of designer clocks—don't expect this piece to come with a bargain-basement Ikea price tag. [Alessandro Zambelli via designboom]