What law does the constellation use _ what law does the constellation use?

What theorem of applied psychology in constellation test is so accurate?

Barnum effect is a psychological phenomenon proved by psychologist bertram Fowler in 1948. Named after barnum, a miscellaneous technician, I believe it is easy for everyone to believe that a general personality description is especially suitable for him. Even if this description is empty, I still think it reflects my character, even if I am not such a person at all.