The method revolved around the use of Zener cards, or ESP cards as they are more commonly known. There are a total of 25 cards each bearing one of the five symbols, repeated five times. There would be two volunteers, one to play the role of the 'sender' and the other to be a 'receiver'. The cards would be well mixed so that nobody could know where any of the cards were in the pack and then 'the sender' would select the cards one at a time and mentally project an image into the mind of the 'The receiver' who would attempt to name the card said person was thinking of.
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