You want to perform a very easy magic trick? QUEEN is for you! You show to the spectator 4 queens, he can shuffle them, and you ask him to choose 1 queen between the 4… Imagine that he has chosen the quien of heart… You show to the spectator a deck of card inside your pocket, you open it… In the deck, the queen of heart is upside down, and it is the only blue in the red card.