Pseudo-sciences tend to make vague and non-falsifiable claims which cannot really be disproven empirically. Can you arbitrary divide people in four groups named

Pseudo-sciences tend to make vague and non-falsifiable claims which cannot really be disproven empirically. Can you arbitrary divide people in four groups named after colors? Of course. It is it in any way useful except as a method of selling books and seminars? This remains to be seen.