UNIQLO
It's a grid. You play with it. (flash)
posted by dobbs on Jan 7, 2008 - 44 comments

Lightning calculator and "mathemagician" Art Benjamin goes through his paces in a 15 minute video.
posted by Wolfdog on Dec 19, 2007 - 32 comments

Nowhere-neat tilings are actually pretty neat. We all know you can't "square the circle", but do you know the story of squaring the square? (And by the way, even if you can't construct π with a ruler and compass, you can come awfully close without too much work.)
posted by Wolfdog on Dec 4, 2007 - 10 comments