The Phantom Queen is an awesome optical illusion

Watch this video but get ready to hit pause at the 11-second mark, so the secret isn't revealed before you savor the apparent magic of a chessboard queen that appears only in a mirror reflection of a chessboard. What's more, the queen seems to move of its own volition. How is it done? Press play, and the secret is revealed. The way it's done is clever, but I was disappointed sorcery wasn't involved.