Charlotte Van Der Waals’ World Time Clock is an example of design that is thoughtful and ingenious. The clock manages to convey multiple timezones in a single clock face without the use of buttons, gimmicks and well, technology. Just roll the clock so that the desired city etched on the sides is on top. 12 sides with 2 cities per side represent the 24 global time zones.
For those of you who just have to aquire one now, it is available at Junro.