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

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Thames & Kosmos

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WHAT’S HAPPENING

Build a tower with the six containers. First, do it with both hands and

both eyes open. Simple, right?

Then try it with one hand while keeping one eye covered with your other

hand. That will be harder for sure, because we need two eyes for depth

perception. Since your eyes are located next to each other in different

parts of your face, each eye sees the container from a slightly different

perspective. In fact — even though you don’t realize it — you are looking

at two images, which your brain can use to determine the distance to the

containers. If only one eye is open, it’s harder to perceive how far away

from you the containers are. Finally, try constructing a tower with your

eyes blindfolded. This will give you an idea how a blind person feels:

They have to rely on their other senses.

Bonus Experiment:

Have an adult blindfold

you and lead you around

by your hand — through

the apartment, through

the house, outside for a walk.

Your guide will have to give you precise

instructions: Is there an obstacle in your

path? Are there steps? Where does the path

get narrow? Where is it steep or slippery?

How fast should you walk, and when should

you stop?

Remember the peek-a-boo game? You can also hear with

a single ear, but two ears help you know the direction

from which a sound is coming. Your eyes are like your

ears — you have two of them as well! Just for seeing,

one is enough, but to estimate distances, you need both.

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