Expand three postcards. Picture looking in one direction. Two extreme cards flip over backwards. The average picture remained. Now turn all three cards. Pictures again look at the viewer. Remove cards in his pocket. Then, as if having thought suddenly, that did the trick until the end, again take them in hand. Now flip over the middle card, the pictures remained visible only in the extreme cards. If you turn all the cards of the other party, the picture will appear on all three.
What is the secret? To demonstrate need three double postcard (glued pictures outside) and the other three most common. All the pictures on the cards are the same.
For the first part of the focus are two common cards that are flipped (extreme). The middle picture on both sides. The other three secret cards are in your pocket.
Termination of focus and continued his show made for the eyes of all to replace some of the other cards. Now take two glued postcards (far) and one normal (center). And everything is repeated, only now turns first average postcard.