Magic & Math with Cards

Lecture 48 · Performance

Little Fibs

Two cards from their sum

Video in production

This lecture is still face down. Its script is written; filming and animation are under way.

Meanwhile, play the trick

What you will learn

Perform Little Fibs from an openly known six-card packet and decode any two distinct selections from their sum.

The trick in this lecture Little Fibs Choose two of six cards and tell me only their total. I'll name both. Play the trick

Before this lecture

Nothing. This lecture is a fine place to start.

In this lecture

An outline of the lecture, scene by scene, with the statements that appear on screen. It follows the draft script, so details may change in production.

  1. Introduce known packet and free pair selection

    At the table
    • A=1; K=13
    • Choose exactly two distinct cards

  2. Decode and repeat

    At the table
    • Report only the sum

  3. Reveal the numerical preparation

    At the table
    • 1, 2, 3, 5, 8, 13

  4. Prove pair uniqueness by exhaustive table

    • 6 choose 2=15 distinct pair totals

  5. Give an exact validated decoder

    • Choose largest available value < total
    • Check total is valid

  6. Distinguish Fibonacci facts and selection size

    • Exactly two cards is information

  7. Locate the actual information inputs

    • Known packet + total → pair

  8. Play and retrieve

    • 11→3+8; 13→5+8

Companion interactive

Decode a hidden pair from its sum, validate inputs and design collisions.

The trick page is this lecture’s companion: be the spectator, lift the curtain to step through why it works, try the challenge, then learn the handling.

Open Little Fibs

Sources

How these sources were used
  • Colm Mulcahy, Mathematical Card Magic: Original effect; adapted to openly introduced six-card packet, removing stock-control handling. Exact-two-card uniqueness and identity mapping preserved.
  • Numberphile, “Little Fibs”: Original-author performance reference, not copied narration.