The Rorschach Inkblot Test is a projective psychological test developed in 1921 by Hermann Rorschach.

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It was used to measure thought disorder for the purpose of identifying mental illness.

It was inspired by the observation that schizophrenia patients often interpret the things they see in unusual ways.

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In the test, the participant is shown a series of ten inkblot cards and directed to respond to each with what they see in the inkblot.