It's not used much now, but it was used here not all that long ago. And NO, psychologists did NOT make their own tests. And they did not just randomly interpret the test. The test was bought and ONLY sold to professionals and they had to make sure the real test could not be owned by anyone than professionals. The real test was never published in books etc. The interpretation is rather complex, and by those old means, they actually were spot on with some things, like how people with this and that issue see images. It is far from what you see, it is how you see it, if you see the full picture, if you include the white spaces, if you include colors etc.

It's not a very precise test but also I don't think it should be ridiculed by people saying that psychologists just splash color on paper and show to people. Especially people who claim to have studied psychology should not say those things. But I notice anyone can be a doctor on the Internet...