Reverse engineering a custom CPU from a single program
Hah, I use that "resize the window until aligned/a pattern emerges" trick, too. If you think about it, humans' pattern recognition over vision works impressively well. I'm sure there is plenty of reason why we evolved that way, but the fact that you can take that ability and adopt it to something which is completely artificial and "unnatural" (file representations on a screen), completely without any conscious effort (you just resize the screen until you suddenly intuitively "perceive" a very abrupt and markant change), is amazing.