joys of rotations

I just finished spending an obnoxious amount of time making a set of slides illustrating the rotation of factors in factor analysis, for the graduate methods class I'll be teaching in the spring. I resolved that I would improve that part of the course, and I'm currently reading a book on intelligence testing which is a good occasion to ponder factor analysis. Anyway, it involved me making some PowerPoint graphs of a form I hadn't done before, as well as doing some trigonometry and holding a protractor up to my screen. In a burst of pride, I've uploaded the slides here. Granted, they don't make much sense without the accompanying handout, but they still look cool.