Navigate your MP3 player with a trackball

Wonder what made Dae-Ki Hong come up with this concept at a time when people are finding trackballs unwieldy and ball mice are on their way out.

The Trackball MP3 Player (inspired by the mouse?) does away with the need of pushing buttons or using a touch-sensitive scroll wheel. All you have to do is roll the trackball in the direction of whichever control you wish to execute. It works the same way when placed upside down.