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Mayette Magie Moderne has had these ESP Cards specially made for you by The US Playing Card Company, the manufacturers of Bicycle cards.
The Bicycle brand cards have the classic Rider backs, and on their faces they have the five ESP (Extra Sensory Perception) symbols: Circle, Cross, Waves, Square, and Star.
These cards were first created by Dr. Karl Zener (sometimes referred to as Zener Cards), and they have been used by Dr. J.B. Rhine of the parapsychology department of Duke University in the United States for research into Paranormal Phenomena's.
These cards are largely used to measure the individual's degree of parapsychological potential. The American Army was very interested in Dr. Rhine's researches. The subject has also been a great source of inspiration in general (for example look at "Fury", the excellent Brian De Palma movie, with Kirk Douglas and Amy Irving).
As far as we are concerned, ESP cards have been, and still are, a great source of inspiration to the magical arts.