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Eye and illusions.

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1. Take two pieces of white papers with same size. 

2. Draw the picture of a cage on one pa¬per and the parrot on the other. 

3. Then insert a stick and attach the blank sides of the papers with gum, see the figure. 

4. Let it dry then twist the stick rapidly. 

5. When we twist the stick rapidly, we see the parrot in the cage. What we are experiencing is an illusion.

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