[스크랩] Lesson 4 Can You Believe Your Eyes?

Lesson 4
Can You Believe Your Eyes?

Talk and Practice

A
A: Excuse me. I’d like to exchange this sweater.
B: What’s wrong with it?
A: There’s a hole in the sleeve. I didn’t see it when I bought it.
B: Do you have the receipt?
A: Yes, here it is.
B: Just a minute. I’ll get you a new one.

B
A: I don’t believe it!
B: What?
A: Well, I lost my favorite pen last week.
   I never thought I’d find it. But there it was under my bed.
B: You’re always forgetting something.
A: Umm... I’m afraid you’re right.

Read and Think

Can You Believe Your Eyes?

People say, “Seeing is believing,” but this is not always true. Your eyes and your brain can be fooled. What happens when they are fooled? How can such a thing happen? If you want to know, here are some answers.

When you see something, your eyes and your brain are working together. Light carries a picture, or image of an object into each of your eyes. As light enters your eyes, the image of the object is turned upside down. You receive two upside down images of the object, one in each eye.
Messages about these upside-down images travel to your brain. Sight centers in your brain turn the images right-side up. These centers also join the two images into one. Your brain then figures out what you are looking at, and you see the object. Then your brain must try to understand what you see. To do this, your brain compares what you are seeing with what you have seen in the past.
Sometimes your brain makes small mistakes. It bends a line that is really straight. It makes objects smaller or bigger than they really are. Your brain fools you and an optical illusion happens.
Sometimes your brain is led to see in two different ways. Sometimes when you look at a picture, you see one thing. When you look again, you see something else.
Look at the drawing in A. Sometimes you will see a vase. Sometimes you will see two faces. Your brain sees the picture in two different ways. Look at the drawing in B. As you look at it, you may see a young woman at one time and an older woman at another.
In pictures A and B, there really are two different images. Your brain can see and understand both of them. So your brain sometimes sees one image, and then the other.

How to see a ghost
Sometimes you can even see things that are not really there. Look at the black image of the ghost below for 30 seconds, and then look at the doorway. You should see the white image of the ghost in the doorway. This happens caused because the messages to our brain become confused. You are not really seeing a ghost, you are seeing an optical illusion.

There are other kinds of optical illusions. When we read a sentence which has a word missing, we try to guess what could be in the space. In the same way, when we see only part of an object, we try to guess what the rest of the object is. Look at this picture. What object do you see? What can you guess?

Here are three more illusions. First, which is bigger, the black square in the white box, or the white square in the black box? Or are they the same size?

Next, which colors are darker, the colored squares in the white boxes or the colored squares in the black boxes? Or are they the same?

Finally, can you see dots in the white lines between the blue squares? These three illusions are caused by your brain as it looks at the images side by side. Perhaps now you won’t say, “I’ll believe it when I see it!”

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