The other day I was at a magic shop in Mesa, AZ and I bought an auto spring fan of cards on a whim. If you don’t know what an Auto Spring Fan is, it’s a packet of cards that pops open into a fan automatically. I thought I was probably just going to have a kid hold them in pictures after the show.
During the drive to the gig, I thought about what else could be done with them. There’s not a lot you can do besides open them. Then I got an idea, they could be used as a card revelation. The idea is the whole fanned deck would turn into the selected card.
I realized that if I held the closed deck face down and fanned them so that I was tightening the spring, I could show the backs of the cards on the edge that’s normally hidden.
This allows me to have all the cards on the back (except for the top card) to have the corner shown when fanned to be the same card. Having the top card change would simply be making a flap card.
…at least that’s how it is in my head. Now to actually make the gimmick, which is the real work!