A fortune teller (also called a cootie catcher,[1][2] chatterbox,[3] salt cellar,[4][5] or whirlybird,[3]), is a form of origami used in children's fortune-telling games. A player asks a question, and the fortune teller operator answers using an algorithm to manipulate the fortune teller's shape. Questions, answers, colors or numbers may be written on the fortune teller.
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A paper fortune teller may be constructed by the steps shown in the illustration below:[2][6]
To use the fortune teller, the player telling the fortunes holds the four corners of the paper with three fingers and a thumb, keeping two pairs of corners together and the other two pairs separated so that only half of the internal sides of the corners are visible.
Manipulations are done by various similar methods, for example: The player asks a question of the person holding the fortune teller; this question will be answered by the device. The holder then asks for a number or color. Once the number or color is chosen, the holder uses their fingers to switch between the two groups of colors and numbers inside the fortune teller. The holder switches these positions a number of times: which may be determined by the number of letters in the color selected, the number originally chosen, or the sum of both. Once the holder has finished switching the positions of the fortune teller, the player chooses one of the flaps revealed. These flaps often have colors or numbers on them. The holder then lifts the flap and reveals the fortune underneath. Steps may be repeated to suit the users.[1][6]
As well as being used to tell fortunes, these shapes may be used as a pincer to play-act catching insects such as lice, hence the "cootie catcher" name.[2][5][7]
The "salt cellar" name refers to a different use for the same shape, in which it stands on a table with the four points downwards; the four open pockets may be used to hold small pieces of food.[5]
This shape was introduced to the English speaking world under the name salt cellar in the 1928 origami book Fun with Paper Folding by Murray and Rigney (Fleming H. Revell company, 1928, p.10). The use of paper fortune tellers in England has been recorded since the 1950s.[8] Although the phrase "cootie catcher" has been used with other meanings in the U.S. for much longer,[9] the use of paper cootie catchers in the U.S. dates back at least to the 1960s.[10][11]