A digital clock that makes you do math to tell the time

This clock (supposedly made for kids) cracks me up. To tell what time it is, you have to do some simple math.

Here's its story:

The Albert Clock is named after Albert Einstein and inspired by an apocryphal anecdote: that Einstein was bad at math. Designer Alex Schindlbeck, who conceived this clock for a small Paris-based company, set out to turn classroom boredom into mental calculation skills. He gave the standard alphanumeric segment font a makeover, with improved readibility of numbers and mathematical symbols. This engaging educational tool caters to children's natural play instincts, and the satifsying delight of problem-solving.

The Albert Clock is only available at the MoMA Design Store (for $340!).