Mac Paint, the program that Knuth asked to study for his Art of Computer Programming has been released to the Computer History Museum. Highly regarded Knuth called MacPaint the "best program ever written". Bill Atkinson, the programmer, was not only a visionary but highly productive. Ahead of his time he later of programming:
It's an art form, like any other art form... I would spend time rewriting whole sections of code to make them more cleanly organized, more clear. I'm a firm believer that the best way to prevent bugs is to make it so that you can read through the code and understand exactly what it's doing… And maybe that was a little bit counter to what I ran into when I first came to Apple... If you want to get it smooth, you've got to rewrite it from scratch at least five times.