Magic prop "WOW! Red Back" This is a magic trick where the color of a card changes, and it's emphasized that it's a groundbreaking piece where the process of the change can be visually confirmed. "WOW! Red Back" is a magic prop that changes the color of a card. You can actually see the card fade out and the next card fade in. It looks like a CG video and has an incredible visual effect. It's an innovative magic trick, as if future display technology has slipped into the present.