A small envelope with a hole cut from its address side is examined. A deck of blank-faced cards is then freely displayed and one blank card is openly slid into the envelope which is left in view.
From a regular deck, a spectator touches the back of any card. Let's say it is the 6C. This card is waved over the envelope and when the previously blank card is slid out it is seen to have now printed itself to match the selected 6C.
1st edition 2023, video 8:38.