If you tired of that old wall clock with the common numbers, here is a clock that should be interesting for you. The Pi Wall Clock is something that may leave you guessing or even give you some hints if you are having problems in mathematics.
The wall clock annotates each hour marker with its angle in radians from the 12 ‘o clock position. Geeky as it may seem, this is one wall clock that should be something for the math wiz out there.
The clock measures about 10 inches in diameter and is protected by a black plastic frame and clear cover. The clock runs on a single AA battery and costs about $17.99 over at Amazon.com