Card Divination

Performance and Patter

Setup: Ask the spectator to shuffle a deck of cards and remove any 10 cards.

Begin: “Today I’m going to demonstrate a little piece of card magic that works with the power of numbers. Before we begin, I want you to look at these 10 cards you’ve selected and think of any number between 1 and 10. Don’t tell me what it is.”

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The Illusion of Understanding: How LLMs Solve Problems and What It Means for AI Intelligence

An article written by Claude.ai on how LLMs solve problems.

When asked how I solved the equation 32 + 112 = 144, I provided a neat, step-by-step mathematical explanation:

  1. Line up the numbers by place value
  2. Add the digits in the ones place: 2 + 2 = 4
  3. Add the digits in the tens place: 3 + 1 = 4
  4. Add the digits in the hundreds place: 0 + 1 = 1
  5. Therefore, x = 144

It looked like I was demonstrating mathematical understanding. But was I being truthful about my process? Not exactly.

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Magnetic cards

Nick Trost’s Subtle Card Creations Vol. 2 has a trick called the Magnetic Cards. It basically is a four ace trick that is similar to the Gemini Twins. His description of the effect: The performer and a spectator each hold a shuffled half-deck. The spectator follows the performer’s actions. They each remove a card from their half-deck. They rub it on their sleeve to “magnetize” it. Then, they replace it face up into their respective half’-decks. Each half-deck is spread to show that each “magnetic” card has attracted two aces.

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