The Curse of Spectrum by Paul Gordon -TrickIn 2003 Paul Gordon released Spectrum. It was and is a big hit. And, he's made it easier and more convincing with The Curse of Spectrum. Top quality special cards supplied and online video tutorial. It's a worker and you're gonna use it. Effect: Four Ace of Spades are convincingly shown to be double faced. You magically get four blue backs and they change to four different colored backs.