binary clock

The ultimate way to be cool, geek and to improve your mathematics skills. The current time is displayed in vertical columns, one digit per column. A column has four dots/lights/thingies, meaning the powers of 2 (2^0 = 1, 2^1 = 2, 2^2 = 4, 2^3 = 8), actually the digits of the according digit of the current time in binary. When a dot lights, then that digit of the binary number is one, if it does not, it's zero. It may sound complicated but it takes only a little practice to be able to read it as fast as you read a "normal" clock. Aviable as a Gnome applet, Windows software, or you can order it in parts or assembled as a desktop or wall clock. Unfortunately, no wrist-watch version (dumb, geek way to amaze girls) is known to exist.

Though not quite the same as the binary clock described above, RSI Digital, based in Norway, does offer a binary watch. Starting at 25 US dollars, you can confuse the hell out of your less-enlightened cow-orkers. And they just plain look cool, even if you choose to leave the watch in its base 10 display mode.

The watch's display, instead of having dots, simply has a ones-and-zeroes time, like this:

01101
001011
100000

Which, of course, translates to 13:11:32.

This version also incorporates the more mundane features most of us expect in a digital watch these days -- stopwatch, alarm, timer, and Indiglo-style backlighting that they can't call Indiglo because Timex probably trademarked the hell out of the name.

Refer to http://www.rsi-digital.com/ to buy one of these digital marvels for your own wrist. This is not a paid advertisement; I just think the one I bought is really neat.