Today's clock uses the midpoint circle algorithm to draw gradient arcs that spin around to tell the time in a visually pleasing, but hard to read way (the photo shows 10:25:50, approximately). The colors are randomly selected for each button press.
Video:
http://www.flickr.com/photos/osr/573515 ... 084215019/Source:
https://bitbucket.org/hudson/watches/src/tip/arcs/