India-born designer Saikat Biswas really flexed his design muscle to create the Obligatory Designer Clock. It doesn't have any hour and minute hands; instead, the hour markings dynamically change to show the time.

From 03:00 - 03:59, the 3rd marking slowly fills up by the minute. At 04:00, the 4th marking appears and fills up.

To see it in action, check out the time-lapse video on the left. Too bad it's only a concept...