The thing about obsession is that it preoccupies a mind, it turns around and around, and once in the hands of a professional the experience becomes increasingly defined by the extent to which the obsessing is unwanted, or unreasonable and whether it produces anxiety. If it is unwanted and if it does produce anxiety it's deemed unhealthy by the great minds.
And then there's the question of whether the obsessing is reasonable or not. Oh
Holy Night, How Sweet It Is to be a professional! Years and years of study, long
hours in libraries, du-wops and diddles on the business card to tell me that
Chapter Seventeen might not be that important. Well they can kiss my fifth
metatarsal, the one on the right foot.