Ask the audience to imagine that you have an invisible deck.
Ask a spectator to choose a card (mentally of course) and to take it back face up in the deck.
The spectator reveals his choice.
Take the deck back in the bundle, and take the visible deck which is inside.
Display it, the unique returned card is the chosen card.
Then you return the card : the back is blue while the other card's backs are red.
Le comique l'emportera très rapidement lors de votre choix de routine.
Ce jeu est aussi appelé "le Jeu Invisible".