You give an envelope to a spectator with a prediction. Now show a deck of white cards with printed shapes (all different).
The spectator can shuffle himself.
Perfect to combine with PSIMBOL DECK.
He chooses the geometric shape while he has the deck in his hand.
No rough and smooth.
You shuffle them very well and also give them to a spectator to shuffle. Then you wrap the cards with a rubber band and while the spectator is on the other side of the room you ask him to lift up any card and remember the shape.
Finally ask the spectator to name the chosen shape and open the envelope revealing the matching prediction.