The Rorschach inkblot test, created by Hermann Rorschach, is a psychological assessment tool using ambiguous inkblots to gauge personality and thought disorders, despite initial skepticism over its projective use. It consists of ten symmetrical cards and is administered in two phases: free association and inquiry, assessing the subject's perception and response. However, the test has limitations, including a lack of objective reliability and validity, making its clinical effectiveness debated.