A large card is displayed within a bright blue, stiff envelope which has a cut-out window on its front. The card illustrates a large solid red spot and a large solid yellow square. A child is asked to select one or the other, and whichever is chosen, (eg: solid square), the performer states that he will make it change colour. He reverses the envelope, blows on it, and reveals the square is now BLUE! (he blew it!), but the children are not impressed – they are sure another card is being used. After much by-play, the performer finally blows on the blue square, and when it is slowly removed from the envelope, the children visibly see it gradually losing its colour – AND IT IS NOW A CUT-OUT SHAPE! The envelope is left empty. Special illustrated card(s) in colour, stiff cardboard window envelope, and full instructions.