If the magician can get your brain to misinterpret the information sent by the eyes, an illusion is in the making! Take a look at this picture. What do you see where the yellow lines cross between the squares? Are those spots really there?

To learn more about optical illusions:

1. Go to the Is Seeing Really Believing? WWW Sheet and print it.

2. Visit these Web sites. Then complete the WWW sheet.
    Optical Illusions
    Shimmer

3. To see other optical illusions, visit these Web sites.
    Squirming Palm
    Bird in a Cage