While I was writing new episodes for a famous and yet uncredited TV comedy series , I came up with the plot in which one of the characters, an actor, is having trouble with getting into a character's skin and his best friend, originally a writer, that recently started seeing a psychoanalist, suggests he tries a psychology type test called Myers-Briggs - whose name, and its own creators' were invented - for composing the character. I took inspiration from an already existing personality type test, that classifies the types into fleumatic, choleric, etc. As I had tried it before and had trouble fitting within one of the types, I though that, in such cases, a better system would be a more comples one, with combinations of two or more determining personality traits. I set up for four, concluding that any such classification system is an abstration, and the more types, more precise it is. As I digged into it, relying on my rudimentar knowledge of psychology, I found