Unit 3D, Vocabulary and Speaking Exercise 2B, page 48.0:00
If you stand at the end of a train track and look down it, what do you see?0:29
The further down the tracks you look, the closer the two tracks seem to be.0:35
Eventually, they appear to touch, but we all know that they don't really.0:40
Our eyes are simply playing tricks on us.0:46
So why don't our eyes always see the world as it really is?0:51
Well, simply because seeing is a complicated process.0:56
Our eyes work together with our brain to understand what we are seeing.1:00
Because our eyes take in images all day long, our brain tries to help us to make them simpler so that we don't worry about unimportant details.1:06
Our brain then learns how to see things in a certain way, which may not always be correct.1:16
When we watch tv, for example, our brain has learnt to see movement.1:23
But in reality, we are seeing a series of individual images very quickly.1:28
This is why we can have so much fun with optical illusions.1:34
Our brain sees things that aren't really there, or fails to see something that is there.1:39
Optical illusions can teach us some important lessons about life.1:47
Firstly, there may be more to a situation than we see at first.1:52
Just as we may see one thing when we first look at a picture and something else when we continue to stare at it.1:56
Also, there is often more than one way to see things.2:03
It's OK if you and your friends have a different opinion about something.2:08
For example, you are just seeing things in a different way.2:11
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