A mentalist's impossibility: you divine a number a spectator only thought of after learning a grand total — then reveal that you had already predicted the second participant's number before any of it began.
Subtraction is a high-impact mentalism effect that uses a peek wallet to pull off the impossible. Two spectators write down secret numbers; you make a blind prediction before they're added together. Once the total is revealed, you divine one participant's number with precision and, as the final kicker, show that the prediction you wrote at the very start matches the second spectator's number exactly. Pure logical impossibility!
Uses elegant mathematical principles to create an impossible, logical effect.
A mentalism effect that leaves spectators speechless.
Complete manual with detailed explanations and variations of the effect.
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