Daniel Shiffman's Processing Workshop
Clocks http://processing.org/reference/second_.html
http://samuelwan.com/processing/ClockFace_01/
http://www.cise.ufl.edu/~fishwick/simpackj/simpackproc/gallery/clocks/
http://www.uncontrol.com/_clock/
http://mediaknitting.v2.nl/paul_cage/abstract_clock/applet/
http://atari.uniandes.edu.co/barragan/clock.html
