I've been thinking about this topic quite a lot recently. What exactly is obsession ? Is it a good trait indicating perseverance for a goal ? Or is it a sign of a psychological disorder ? Is it a sort of fixation ? Is isolation its main cause ? Also, is there a reason why geniuses are often obsessed with their fields and thus, driven to insanity ?
I think the most famous kinds of obsessions are obsessions with computers, chess, books and maths. However, is there a general theory to define obsession ? Giving examples of obsessions with different fields would clear doubts.