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Have someone pick a number from 1 to 16 and these amazing alder wood cards will quickly determine the number. The secrets of these long lost cards were found in a 1942 book by Maurice Kraitchik called Mathematical Recreations. They are also called window cards and have a fun magical edge to them. Each card is 1.3" x 4" x 1/8" thick alder wood with the numbers and text deeply laser engraved. Also look for our other more complex version of the cards on the website.
Difficulty level: n/a
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