The performer displays a small wooden box and shows it’s empty. He puts the lid and places the box on the table.
Then the magician shows a deck and as a spectator to choose a card and to loose it in the deck.
The magician takes the deck and asks the spectator to check if he sees his card.
While the spectator can’t find his card, the magician takes the wooden box and opens it.
The card has appeared folded inside of it.
The magician takes it and holds it to the spectator to check the card.
It’s the card chosen by the spectator!