Retention of vision
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Retention of Vision is a conjuring term referring to the perceived image of an object during a vanish (usually associated with vanishing coins). In a Retention of Vision vanish the spectator sees a coin placed on a palm and as the fingers are closed around the coin it is secretly removed, but, due to the fact that the retina still retains a fleeting image of the coin for a fraction of a second, the spectator will be convinced that the coin was placed in the hand, when in fact it wasn't.
