Thames & Kosmos Kids First: The Human Body (Version 2) handleiding

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Thames & Kosmos

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Handleiding

Bonus Experiment:

Even if it doesn’t look that

way, the red lines are the

same length, the red

circles are the same size,

and the wall is straight!

It’s really unbelievable

what our brain can do —

but it can also be

deceived. Sometimes our

eyes will see something

that our brain analyzes in

the wrong way. That’s

known as an optical

illusion.

WHAT’S HAPPENING

Hold the magic telescope in front of one eye and hold your other hand a

little way in front of your other eye. Look into the distance and slowly

guide your free hand from the end of the telescope toward your face. Try it

several times if it doesn’t work right off the bat. Suddenly you’ll see a hole

in your hand! Of course, in reality your hand is in good shape.

So why does it look like there’s a hole in it? You have tricked your brain!

Each one of your eyes sees its own image that it conveys to the brain.

Normally, these two images are pretty similar, and your brain combines

the two images into a single whole — without you noticing it at all. In this

experiment, though, the two images look completely different! See for

yourself, by shutting each eye in turn. One eye looks through the magic

telescope and sees nothing but a little circle, while the other eye sees the

entire surroundings. Your brain puts the two images together as usual —

and, well, the result is a lot of nonsense!

Tricked Out

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