The arrangement
Count out exactly 21 ordinary cards. Ask someone to remember one as you show the cards face up, then square the packet without changing its order. They do not tell you which card they chose.
- Deal three columns. Deal the cards face up, left to right, one card per column, then repeat. Each column ends with seven cards. Keep each column’s order intact as you deal.
- Ask only for the column. The spectator points to the column containing their card. Do not ask for its row or identity.
- Gather in the crucial order. Stack the three columns into one packet so the named column is between the other two. Which outside column goes first does not matter. Keep the cards within each column in their existing order.
- Repeat twice. Deal the packet into three columns again, ask which contains the card, and gather with that column in the middle. Do the whole sequence a third time.
- Reveal position eleven. After the third gathering, count ten cards from the top of the face-down packet. The next card—the eleventh—is theirs. Let them turn it over.
The arithmetic backstage: Each middle-column gathering squeezes the possible position range toward the center. After three rounds, every possible choice lands at position eleven.
How to make it play
Keep your dealing rhythm even. Ask the spectator to point rather than speak, then pause before the final count. For a cleaner ending, place the eleventh card face down on the table before you ask them to name their selection.
If it fails
One of three things usually happened: there were not exactly 21 cards, a column’s internal order changed while gathering, or the named column was not placed between the other two. Rehearse the gather slowly once before doing it for an audience.
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