Part of the method involved here is sickeningly cruel beyond belief. It involves causing injury and pain to the animal over and over over again. I'm not being dramatic. The book clearly describes it as "injury," and that's exactly what it is. It's just plain sadistic. Although the description states that the book is for educational and informational purposes only, he nonetheless tells you where you can buy a cobra, and the text is littered with phrases starting with "if you are going to..." and suggestions on what to feed your cobra. Yes, your cobra. The one that you didn't purchase and don't have because the book is for educational and informational purposes only. But if you do have a cobra, here's how you can repeatedly torture it.
In my view, these stacks are most useful for memorized deck routines in which the magician/mentalist is able to read off an apparently random stack of cards in sequence. In my opinion, it would be useful to know that they are not something one would want to use as a stack in which, for example, a card is chosen from the middle of the stack and the magician/mentalist would then be able to name it, as a result of the properties inherent in the stack. I think that may prove to be difficult. Also, although little actual strict "memorization" is involved, one does need to keep track of patterns/and or math, which may or may not be easy depending performers skill at doing that sort of thing under performing conditions. In my opinion, although these stacks are very useful for their particular purpose, the price is a bit steep - considering one can find less expensive, equally deceptive, and easy to use stacks that have a wider range of applications. Interesting and useful, by in my view, just not $28.00 worth of interesting and useful.
The Gimmick MagiZette is an amazing bargain. Not only is there some great magic to be learned in every issue, it also provides a fascinating peek into the world of magic in India, both currently and historically. It also is quite entertaining, sometimes unintentionally so due to difficulties in translation. (I'm actually hoping the translation doesn't improve - the peculiar word choices are half the fun!) You wont be dissapointed. A great value.