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Zener cards (shapes in the form of square, circle, lines, star, cross) are cards used to conduct experiments for extra-sensory perception (ESP), most often clairvoyance.

Perceptual psychologist Karl Zener designed the cards in the early 1930s for experiments conducted with his colleague, parapsychologist J. B. Rhine.

The term clairvoyance is used to refer to the ability to gain information about an object, person, location or physical event through means other than the known human senses, a form of extra-sensory perception. A person said to have the ability of clairvoyance is referred to as a clairvoyant ("one who sees clearly").

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