A classic effect revisited. Here the deck is shuffled by the spectators. The magician shows the shuffled cards again and squares them clearly. And yet the magic happens: the black cards and the red cards are separated!  

Only one technique used in this trick for multiple effects! You have red cards on one side and black cards on the other. If you insert a red card among the black ones and vice versa, you won't believe it, but a miracle happens: the cards remain separate, with red on one side and black on the other! It's crazy!  

Like Dustin Hoffman in "Rain Man", you want to show your exceptional instant memorization skills. After thoroughly shuffling your deck of cards, you announce that you have memorized the position of the red and black cards; but in demonstrating this, you fail miserably! But surprise, you say that half of the cards are red-backed, and the other half are black-backed; and that in truth, the cards have been sorted by their backs!!!