The Rorschach test was developed in the 1920s by Hermann Rorschach who observed that children responded differently to inkblots. It is used to assess a person's personality and thought processes. There are 10 standardized inkblots shown one at a time while the examiner takes notes on the responses. The test aims to reveal patterns and clues about the test taker's personality, but some argue it is unreliable while others view it as a useful diagnostic tool.