Stark reminder

Can street photographers be classified by personality type? That's the question posed by Andrew Stark's Escaping Into Life, at least initially, before diverging down the rabbithole into street photography (cue Jon Stewart musical phrasing) Won-derland. The essay, which I briefly profiled back in February, has recently been made available as a 2.9 MB PDF. In the interest of full disclosure I should say I was a participating photographer in Stark's study and that my Myers-Briggs is ISTP, but you've probably guessed that already.

The Sydney Equation, from Andrew Stark's Escaping Into Life.
Don't worry, it makes sense in the context of the essay. Or does it?