It's for a 2 card transpo/ chicago opener effect.
One of the cards is forced (black), the other is a free selection, but for the free selection I'll spread a section that is all red.
I change the black card into the red one.
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I have to do this effect.
I can either do it with a visual change or an invisible change (top change). If there is no way to get a twirl change to play big, I might go with that.
They still have the moment where the spectator opens the card in their hand and find that it's changed.
Should the odd card be on the floor with their foot on it, on a stool with their finger on it, or folded in their hands?
Thanks for the replies