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Ben Blau
Loyal user
237 Posts
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Posted: Sep 29, 2003 12:03pm
I was wondering if anyone here is familiar with Martin Gardner's effect called "Negative Psi." I think it's an interesting principle, which surely must have other applications (though I've not encountered it elsewhere). Has anyone seen the principle utilized in any other routines?
Ben Blau
Ben Blau
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Nir Dahan
Inner circle
Munich, Germany
1391 Posts
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Posted: Oct 1, 2003 7:35pm
Can you please refer us to which Gardner book it is in?
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Ben Blau
Loyal user
237 Posts
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Posted: Oct 1, 2003 9:50pm
I read it in "Martin Gardner Presents."
Ben Blau
Ben Blau
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Scott Cram
Inner circle
2458 Posts
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Posted: Oct 2, 2003 2:23pm
It's on page 140, BTW.
I haven't seen anything else with this, but playing around with it I did notice one interesting thing with this principle.
Once you run through the whole trick, you've actually reversed the stack. If you're using A-K (obviously, it can be any 13, but just so you can see what I'm talking about), and you cut to the ace to the face to turn it the same way as the other cards, then turn the whole pack face down, it's now K-A instead of A-K. I wonder if there's some way you could play on this subtle reversal of order...
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Ben Blau
Loyal user
237 Posts
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Posted: Oct 2, 2003 11:01pm
I noticed the same thing, but you're right, it's offset based on whatever number they thought of.
I've been working on a couple of presentations for this using 5 ESP cards. For example, I give the packet to a spectator to shuffle, and as he's doing so, comment "I'm thinking of one of those symbols."
I then take the packet back, stating that I want to see which position it occupies in the packet, so that I can "project" that information to the subject as well … ostensibly to "help him out" a little.
Write down the appropriate symbol on a pad, or have some other way of making good on your claim at the end, and have him go through the process. As he turns the cards face up one by one, you can chide him (in good humor, of course) about how his "negative intuition" is remarkable. "That's not it... That's not it either... Look at the bright side, your chances are improving with each attempt!"
The last facedown card, or course, matches your "prediction," of sorts. The feeling at the end is that you didn't so much prove the person's "negative intuition," but really predicted what card he'd turn over last.
I find this principle very interesting. Tomas told me that it has been acknowledged as the "George Sands Prime Number Principle." It's indicated in Martin Gardner's write-up that he published a routine, "Lucky Thirteen," in the 1975 Pallbearers Review based on the principle.
Ben Blau
Ben Blau
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Paul
Inner circle
A good lecturer at your service!
4206 Posts
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Posted: Oct 15, 2003 5:31am
There are some card effects with the prime number principle used in the new Duffie/Robinson book "Card Conspiracies Vol.2".
Paul.
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Ben Blau
Loyal user
237 Posts
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Posted: Oct 15, 2003 12:34pm
Thanks Paul. I've been pointed in that direction by a couple of other Café members in PM's. I'll pursue the reference.
Ben Blau
Ben Blau
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