Timekeeping For Geeks ;-)

I don't comprehend all these hourly designations, but some of you probably will (...worth a chuckle):

http://www.beaverdam.k12.wi.us/bd/content/mathclock%20withnumbers.jpg

...and here a prime number watch:

http://tinyurl.com/2uop37u 

And finally a watch based on, of all things, the Sierpinski Triangle:

http://tinyurl.com/2fqolo5

(Perhaps some people just have too much time on their hands! ;-)