What is the Rorschach test?

The Rorschach test is a diagnostic tool used to gain psychological insight. It uses 10 standard black or coloured inkblot designs to assess personality traits and emotional tendencies.

In contemporary English, the term Rorschach test is often used metaphorically to describe what psychologists call projective assessment. Put simply, how you see something depends on your 'priors' or pre-existing assumptions.