Part of Martin T Hart's 'Unfathomable' series for two person telepathy acts.

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Back to Back is a truly baffling demonstration of the old ESP tests using Zener cards. You and your partner are sat on chairs back to back at a short distance apart. You are both facing in different directions. One of you is truly blindfolded while the other is not. A random spectator shows your partner a series of truly shuffled Zener cards and you can name each one correctly.
With this routine you will score 100% accuracy as your partner sends thoughts to you without talking. No electronic devices are used, no mirrors, no confederates, no forces, no visual codes. You can be searched before the demonstration, scanned for devices. The blindfold can be examined professionally. During the routine a solid partition can be slid in the gap between the chairs and still you will achieve accurate scores. Cards can be shown to the 'sender' discretely and still you will see the correct shape in your mind.