From David Seah‘s Better Living Through New Media via Crooked Timber and Lifehacker: a clock that’s guaranteed to be up to 15 minutes fast, but you’ll never know how fast, so you can’t game it and you’ll arrive at appointments early, and panting. Downloadable in three versions: Web, Mac, and Windows.

Seah writes, “I offer this clock in the spirit of Chindogu, the Japanese art of creating almost useless objects. Technically, the clock maintains a time buffer of ‘fastness’ measured in milliseconds. This buffer is modified every second by a certain amount,” which varies. “Since you don’t know if it’s fast by just a few seconds or several minutes, it’s safer to assume the clock really is telling the right time, which is just what you should be thinking.”