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The Magic Cafe Forum Index » » Magical equations » » Unknown effect/principle - book reference needed (0 Likes) Printer Friendly Version

art85y
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The effect goes something like this...

The mentalist has his back turned.
1 - 12 cards with various location names on them have been laid out in a 3x4 grid.
2 - The volunteer places a small token on any card, its a totally free choice.
3 - Volunteer moves the token (up down, left or right, not diagonally) by spelling out of his starting location, one move for each letter.
4 - The mentalist instructs that several cards are removed.
5 - The mentalist now instructs the volunteer to move say 5 times. More cards are removed.
6 - The mentalist now instructs the volunteer to move say 7 times. More cards are removed.
7 - Ditto.
8 - Eventually there is just a single card remaining (the one with the volunteer's token on it) and this coincides with the mentalists prediction.

I have 2 effects based on this principle but I would like to explore the mathematics behind it and create my own.

If you know what this effect/principle is called or what book I can look in for info I would be most appreciative.
landmark
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Down the road a piece
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The principle was already old when Martin Gardner got a hold of it in Martin Gardner Presents. For a particularly clever version see Simon Aronson's "Move and Removes" in Simply Simon.
""For those who believe, no explanation is necessary. For those who do not, there is YouTube."

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art85y
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Thank you landmark. Yes, I know it's old but I like it. I will look into both these sources, much appreciated. It is very hard to research something when you do not know what it is called
art85y
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Alas, I do not have either of the books that Landmark kindly cited. Any further help with the NAME of the maths principle would be appreciated as I can then look in older books in the public domain.
murf
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You might want to read the chapter on Topological Forces in Thomas Henry's wonderful book Hidden Numerical Forces.

Murf
art85y
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Thank you Murf, I read your reply today and in the small window since then I have ascertained that I WANT this book. Cool recommendation,
cheers
Art
art85y
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Murf
I am hot on the trail of the TH book and the phrase 'Topological forces', which I was not aware of, is extremely helpful when I want to discuss this topic, unlike my clumsy initial OP.
Art
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