This world time clock designed by Charlotte van der Waals is a very simple and equally smart design to show the 24 different time zones around the world on one clock. The clock is barrel-shaped with 12 sides, each side having two cities written on it that are 12 hours apart. The clock face has no minute hand and tells you the current time (approximately) in whatever city is written on top as you roll the clock over. Very cool.
The World Time Clock is 3.5″ long with a 2″ diameter and retails for $74 at MomaStore.