1.)Invite students to talk about a time when they "thought" they saw one thing and it turned out to be something quite different. Explain that perception and conception may be two different things.
What we perceive we see, may not in truth be what we see.
Use an example of seeing a student in the principal's office. We may perceive that the student is in "trouble" when in reality the student may be receiving congratulations on achieving a goal.
(Knowledge In Perception
)Contains teacher material to provide background information about concept and perception, brain and physical illusion.
2.)Give each student a mirror. Ask students what they see?
Many will answer they see themselves.
Ask if they are in the mirror?
Many will still answer yes.
Explain that the teacher thought each students was sitting in his/her classroom.
Lead the students to discover that while they may perceive themselves to be in the mirror; they are in fact in the classroom.
Through observation we see illusions in the natural world around us.
Ask students if they remember seeing a rainbow. Students should respond that they have. Then ask if they know the legend about the pot at the end of the rainbow. After explaining the legend (if some are not familiar with the legend) ask if they think that they could ever reach the end of the rainbow. Have them explain their responses.
Then ask if the rainbow always moves farther away as we move toward it? Why?
Explain that the rainbow is not the illusion but that the distance to the rainbow is an illusion.
4.)Ask students if they have ever seen a mirage. Recall images of water in the desert, heat rising from the road in summer and such. Explain that mirages are caused by refraction of light between the object and the eye which displaces objects or parts of objects.
Demonstrate the bent spoon in water illusion by placing a spoon in a clear plastic glass of water. Divide students into groups. Have them place pencils in their glasses of water. Students should observe and write about what they see in their science journals.
5.)Show students optical illusions by holding up pictures or by using one of the optical illusion websites. The website listed below has the hollow face illusion.
)This site illustrates optical illusions.
6.)Have students draw a cage in the middle of an index card. On the flip side of the card, have students draw a bird. Attach the card to a pencil or attach string (yarn) to each side of the card. When the card is rotated or flipped the bird should appear in the cage. Let students discover the right way to draw the bird and the cage in order that one is not upside down.
Have students prepare a flip-book to illustrate persistence of vision. Some choices to draw would be a frog jumping or eating a fly, a stick figure running, a dog wagging his tail, a piece of ice melting.
)Scroll down to "Links to Animations" for various animated illusions.
7.)Share the dragon illusion with students by reading or having students read the information from the following website. Then give each cooperative learning group/student a copy of the dragon to put together and recreate the illusion.
(The Dragon Illusion
)This website has the material to download to make the necessary components so that the students may make their own illusions. Follow the instructions exactly in order for everything to work correctly.