A spectator selects four cards from a red-backed deck and they are inserted in the middle of the blue-backed deck.
You remove four cards from a blue deck, show them to be indifferent and insert them into the red deck.
The spectator's four red-backed cards are turned over, and they are all Kings.
Your four blue-backed cards are turned over to show they have changed into the four Kings!
You remove four cards from a blue deck, show them to be indifferent and insert them into the red deck.
The spectator's four red-backed cards are turned over, and they are all Kings.
Your four blue-backed cards are turned over to show they have changed into the four Kings!