by Jean » Feb 1st, '12, 01:51
What's nice about the barcode reveal is that it can be read as 3 of spades or 07 spades.
To prepair you need a 7 and 3 of spades with different coloured backs or a distinct marking.
You put the box with the barcode in view and ask the spectator to name a number between 1 and 10, it's likely they'll say either 7 or 3, if they don't just go into another card trick.
Lets say they pick a seven, you go through the deck, secretly remove the three of spades and lay out the seven of hearts, spades, diamonds and clubs, and use a magicians choice force (Equivocation) to narrow it down to seven of spades. Make a big deal about you not touching the cards.
Remind them at this point that they could have picked any suite and number, and that you never touched the cards, then reveal that the seven of spades is the only card in the deck with a different back, and as a pseudo explanation you show them the barcode.
Invoke not reason. In the end it is too small a deity.