EFFECT:
A folding plastic colourful apparatus is opened and shown to have a coloured spot, one on each side. This gimick is shown on the first illustrations. One of thespots is red, the other is green. The apparatus is closed and the spectator is asked to name the colours of the two spots. When the apparatus is opened it is seen that the spots have changed to yellow and black. Accuse the spectators of having poor memories and close the apparatus again. Ask what the colours are and show they are not yellow and black as they thought but are now red and yellow. On the last change the apparatus is passed to the spectator to open.