The magician shows a small hinged hard plastic folder containing two different colored spots. He closes the board, snaps his fingers, opens the folder and shows the spots have changed color! Without ever removing the board from the spectator's sight, magi rubs one of the colored spots and it instantly changes back to its original color! All may be examined. This is a classic Tenyo effect (T-39) that has been discontinued. If you collect Tenyo, we've got 3-4 left in the store.