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Description
Parimental by Jheff - Book"This is a fascinating work and a tool that supplies the reader with an abundant supply of new and usable material Self working effects, based on clever mathematical principles are often a relief to perform and give you ability to concentrate fully on your presentation. Parimental explores just one such principle with some 20 different effects to choose from along with some very sound presentational advice." From the Foreword by Richard Osterlind
"This is a fascinating work and a tool that supplies the reader with an abundant supply of new and usable material... Self-working effects, based on clever mathematical principles are often a relief to perform and give you ability to concentrate fully on your presentation. Parimental explores just one such principle with some 20 different effects to choose from along with some very sound presentational advice."- From the Foreword by Richard Osterlind
Learn to control your participants' thoughts and predict their actions using the Parity Principle - an underrated, very simple principle published by Martin Gardner in Scientific American in 1960. This versatile principle can be used impromptu or for prepared routines. It can be adapted to use in any type of venue, including online performances.
The basic routine involves setting up a series of nine items in a three-by-three grid. The participant has a free choice of starting on any object. A number is freely chosen, and the participant moves to the left, right, up or down, back and forth. The performer now shows a prediction that shows which objects the participant is not on, and they are removed. This continues until eight of the items are removed, and the prediction reveals the item ended up on. These nine items can be anything you like, and this book is filled with various ideas to spark your creativity.
In this book, you will explore and learn the basics of the Parity Principle as well as many nuances that will allow you to make it even more versatile than ever. There are routines described that use a celebrity, colours, business cards, playing cards, cities, typographic symbols, randomly selected objects, and more. There are also some essays on subjects that will help you more effectively perform these routines, as well as improve your performance of mentalism, in general.
It is a tool that you will use to create wondrous effects, and it is an exploratory journey of an extraordinary principle that you will find amazing and unforgettable.
"Jheff did a superb job writing about and analyzing this beautiful principle. A must buy for all mentalism thinkers."
- Marc Salem
"So glad Jheff is releasing this book. Just BUY IT! You'll love it!"
- Looch
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4.6 ★★★★★
Based on 16 reviews
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Product Reviews
★★★★★ 5
Good Tall Screen
Color: Grey, Size: 1 Large Panel
Easy to roll, easy to assemble with two people, great height, blocks direct sun well
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Reviewed in the United States on April 18, 2026
★★★★★ 4
Great Divider, bad instructions
Color: Black, Size: 1 Large Panel
Happy with this as a room divider. Good price point and sturdy. I suggest skipping the directions and using common sense! The steps are made complicated when they are not ... and if you follow the directions you will have to go back and fix the skipped step of inserting the rods into the screen BEFORE securing the frame. Would buy again.
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Reviewed in the United States on November 15, 2025
★★★★★ 3
Took two people...
Color: Black, Size: 1 Large Panel
It took two people to put this together. It is nice and does the job dividing the beds i needed for the room my teen nieces sleep in.
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Reviewed in the United States on September 28, 2025
★★★★★ 5
Light and easy to move around! Still sturdy and tall like I wanted.
Color: Grey, Size: 2 Large Panels
Easily put together, work excellently for a room divider and taller than I am at 5'9" so that makes the privacy really great for our purposes. The feet turn and so you can get them out of a pathway as needed, the middle one that has two posts in it does not move but the end ones do. Very LIGHT so not hard to move around. Fabric is not see through. We have a lamp on one side and you can see the light through it but that is not an issue for us. The price is right!! most cubicle kinds of walls are so, so, so much money. With these being light and still give privacy the price was great. If you want them for sound, this is not the product for you but really most cubicle calls are not going to give you privacy other than visually anyway and these do that well. The size was accurate and so fit exactly how I needed them to and that was an important point for me. I used both of them in L shapes for my room and the size was right on.
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Reviewed in the United States on August 8, 2025
★★★★★ 5
Almost perfect
Color: Black, Size: 2 Large Panels, Color: Black, Size: 2 Large Panels
The cloth material is sturdy and fits well on the design. Both sides are black and you can't tell a difference between each side. It's extremely light weight and easily movable. We got a double and a single and the single is used as a sliding door. It's definitely not the MOST stable thing but overall it's pretty stable, probably won't work GREAT on carpet. It's not see through at all, which is great, the only downfall is the gap between the two sides. We are using a blanket to cover the gap. It's not 6 foot tall, but you can adjust the feet on it to be taller. Overall it's a great product for the price and can easily be moved out of they way.
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Reviewed in the United States on September 5, 2024
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