The children are shown a red plastic tube, a clear Plexiglas tube on a stand and three balls in the traffic light colours which he takes from a paper bag.
In a playful routine he takes the children through the colours and their meaning in respect of traffic.
Then the Plexiglas tube is covered with the red tube and the balls are put into the tubes in the right order, i.e. first the green ball at the bottom, next the yellow one, in the middle, and then the red one on top, just like the colour sequence in real traffic lights.
Now the magician lifts away the red tube and the children see that the colour sequence is completely mixed up. The red ball is at the bottom, the green one in the middle below the yellow one. Much as the magician tries, he cannot get the sequence of the balls in the tube right.
He now asks a child from the audience to join him and help him with the awkward colours. Together they decide that it must be the red ball that gets things mixed up all the time. So that ball is wrapped up in a piece of paper and given to the child to hold. The magician puts the two remaining balls into the tube.