Object:
an optical illusion (such as two equal lines side by side. The top one has > on each end and the bottom one has < . The bottom line looks longer even though it is not)
I want to show you something here. (Show them the optical illusion.) Which line is longer? (Allow them to respond.) It surely looks like that line is longer, but it is not. In fact, both lines are the same length. This is called an "optical illusion" and it's fun to see how our eyes play tricks on us. (Here, if you choose, show the children other optical illusions. There are books of optical illusions available at most public libraries. Also check under "Illusion" or "Perception" in an encyclopedia.)
