The inkblot test, also known as the Rorschach test, was developed in 1921 by Swiss psychiatrist Hermann Rorschach as a psychological test to examine personality characteristics and emotional functioning. It involves showing subjects inkblots and recording their perceptions. The underlying assumption is that a person's responses reveal aspects of their personality, cognition, and interpersonal perceptions. The Rorschach test consists of 10 bilaterally symmetrical inkblots and uses the subjects' responses to assess factors like thought processes, affectivity, and personal views. It remains a commonly used projective test by psychologists.