this trick the magician uses a transparent perspex board, five E. S.
P. cards with blue back and five E. S. P. cards with red back. Every
blue backed card has its matching red backed card. You will have the
same E. S. P. symbols on the faces of these cards. The magician slips
the blue cards into their slots on the board in an order only he knows.
The spectator chooses one by one, in which matching slot the red cards
should go, but he only sees the back of the cards. When the magician
turns the board around, the blue back and red back cards are in the
same order (top to bottom). You can show the trick twice and the order
of the cards won't be the same. The cards are not specially prepared.