Several pieces of silverware or short wooden sticks (e.g. matchsticks)
Tell members of the group that you are going to use sticks/silverware/etc. to recreate an ancient number system. It is their goal to figure out how the system works. Place several sticks or pieces of silverware in a formation on the table. Unknown to the participants, the number will always be the number of fingers you have placed discretely on the table. If a participant thinks he or she knows the pattern, ask him of her or to give an example rather than stating the answer so that other participants can continue to play.
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