This came up in another thread of mine so I was wondering if somebody here knows of a good recent article/book on eccentricity. When we talk Cluster A personality disorders, we talk odd/eccentric, but what does that mean exactly in operational terms, and how is it different from anxieties and obsessions and full blown mental illness, and how do we assess it reliably? I am not talking schizotypy though they of course overlap. If it's a peculiar habit, something odd about behavior/appearance, then heck, it's a lot of people like that. Most of my professors for one. And a lot of driven people who are on top of their field, specially in sciences, are eccentric compared to the Average Joe. I have looked in a few places but no luck. Appreciate the help.