The app owner shows the screen to the rube as all the cards fly by face up and are fanned out face down.
The owner asks the rube to think of a card and then select one of the face down cards.
The face down card flies up to full screen and hovers waiting.
The owner says, “That is your card.
Tell me your card.” The rube says, “3 of Diamonds”.
The owner swipes the screen and the card flips over to reveal the 3 of diamonds.
The app determines the card by where the owner puts his finger down and which direction he swipes. Sections of the screen are assigned card ‘numbers’ and a swipe direction for each suit.