By now, you've probably got a good idea where the numbers 1 to 12 appear on your standard analogue chronometer, but just for fun, the Science Quiz Wall Clock is labeled instead with a collection of nerdy formulas from which you can calculate the time of day.
In spite of, or perhaps because of one's conditioned knowledge of conventional timekeepers, this gadget is still very easy to read. You may be no math wiz, but in already knowing the answers to each convoluted question, it's possible you could actually learn something in reverse!
DCI makes the dweebtastic Science Quiz Wall Clock for decor within classrooms and laboratories, yet I can see the appeal of taking one home should your area of interest lie within the parentheses of numbers.
Math Geek Timepieces
More Stats +/-
100 Quirky Wall Clocks
Fluid Hour Glasses
Bread and Butter Timekeepers