This alarm clock displays each number of the current time on the face of an individual cube. Pretty spiffy idea but a bit pricey.
This cleverly designed desktop or bedside clock with an alarm and snooze function has four LED cubes each displaying a digit, which can be creatively arranged horizontally or stacked vertically to display time any way you like. Made of ABS plastic. Includes an A/C adaptor. Three AAA batteries (not included) provide backup power.