Graphing Calculator Adventure

I spent a lot of time in mom's office stuck there because I was suspended or somesuch, and, since her workplace was for work, there were no games there. When she was out of the office I would sit at her Mac and use the graphing calculator to create new and interesting shapes, playing with the equations to get it to do more and more interesting things.

Turns out the story behind the development of the program is even more interesting!

via wired