Own, very good discussion, i'll try to answer all:
- kseh, the idea of the box is just like swiftcoder has described, it uses the pepper's ghost technique to create a "holographic" illusion.
- Tom, i'm a not an expert in battle card games, and because of this, it's necessary some expert in order to adapt a game using this hardware. The idea of this card is simple, i'll try to explain to you. First, you put your card in the "table" (rfid reader), doing this, it'll load your player, then it'll "rise" like an holographic character. The other cards, contains power ups, attacks methods and defense, that you will need to use, in order to win the battle. the rfid card is not programmable, it is sold with your own code. Think in a collective battle card like, yugioh, you can buy another characters, another power ups and special attacks. The holographic device, is in order to create an illusion, to make the battle more realistic, to have the impression that with your card, the character raises in front of you. It's not expensive to create this effect, so you can add something "new" to the game environment.