And how about this from 1995: http://web.media.mit.edu/~lieber/Lieberary/ZStep/ZStep-SoftViz/ZStep-SoftViz.rtf http://web.media.mit.edu/~lieber/Lieberary/ZStep/

And how about this from 1995: http://web.media.mit.edu/~lieber/Lieberary/ZStep/ZStep-SoftViz/ZStep-SoftViz.rtf http://web.media.mit.edu/~lieber/Lieberary/ZStep/ZStep-SoftV... ZStep 95: A Reversible, Animated Source Code Stepper Henry Lieberman. Christopher Fry Oh well, nothing new under the sun, and just because it isn't quite as revolutionary as they claim doesn't mean it's not useful.