Zener cards

An ESP card experiment being conducted with Zener cards in 1940
Zener card designs

Zener cards are cards used to conduct experiments for extrasensory perception (ESP). Perceptual psychologist Karl Zener (1903–1964) designed the cards in the early 1930s for experiments conducted with his colleague, parapsychologist J. B. Rhine (1895–1980).[1][2]

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