Hermann Rorschach worked on an interesting experiment: provide people with an ambiguous stimulus (an image) and find out whether their take on it reveals anything useful about them.
Well, of course it does. In fact, everybody's take on everything and anything reveals things about who they are. All of life can be viewed as a projective experiment but Dr. Rorschach thought that perhaps a standardized ambiguous stimulus might be clinically useful.
I think his hypothesis was correct, but only in the right hands. The challenge is in the interpretation of the responses to projective tests.
Are projective "tests" useful? I think they can be interesting, but not necessary.
A biography of Hermann Rorschach peers into the iconic legend of his inkblots.