One of the audience picks a card from a deck.
Put the chosen card in a card case with its face down, and strike the case on the table.
In a second, the color of the card's back and the case changes.
The color of other cards also changes.
Boxing Match has been updated!
Adding a story, the whole performance has become more visually appealing phenomenon.
Instruction is provided through a video.
You can watch the explanation video by scanning the QR code on the back of the package.