Two discs are shown, one in each hand, a black one and a white one. Close your hands and they trade places. Close your hands again and they move back. After several of these switches, the audience thinks they have it figured out, the disks are white on one side and black on the other. You show them to be wrong, one disc is green and yellow while the other is red and blue. Comes complete with performance instructions and a web site address where you are taught how to perform this illusion.