Automatic 2-Way Prediction Envelope : A Utility Device for Mentalists
A Utility Device for Mentalists. The special envelope is used to switch between two possible predictions or sets of instructions, right under the nose of the spectator.There are many Multiple Out Envelopes on the market, but few can be handled by the spectator without them discovering the workings. The Automatic 2-Way Prediction Envelope is such an envelope.