Akemi Iwaya is a devoted Mozilla Firefox user who enjoys working with multiple browsers and occasionally dabbling with Linux. She also loves reading fantasy and sci-fi stories as well as playing "old school" role-playing games. You can visit her on Twitter and Google+.
People have a terrible time distinguishing ridges and valleys on topographical maps, unless the lighting comes from the north-west corner of the map. As such, map makers have long positioned the source of their mock illumination at that location on maps.