The Twilight Watch from ThinkGeek has an creative face that "fades from light to black and back every 20 seconds, reminding us of the ever changing evolution of time." Available now, priced at $119.99. Video after the break.
The optical effect is created using two polarized disks that rotate with the seconds. Twilight's case is 36mm (1.42") in diameter and is made of brushed stainless steel, with a stainless steel case back.
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