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These are other threads.

They go across the first threads.

They go under and over them.

This is cloth.

This is a roll of cloth.

We make clothing of cloth.

We make cloth of threads.

We make threads from wool and cotton and silk.

We get wool from sheep.

Wool is the thick warm hair of sheep.

We take the wool off the sheep's back with scissors.

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We make the threads from the wool by twisting the hairs round and round.

That wheel is going round.

It is giving a twist to the thread.

It is twisting the thread.

We get cotton from the cotton plant.

Cotton is the soft white hair round the seeds of the plant.

These are different sorts of seeds.

Plants come up from seeds which come from other plants of the same sort.

We get silk from silkworm.

This worm makes a soft strong thread of silk and puts it round itself like a coat.

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Wool, cotton,and silk are different sorts of cloth.

We make clothing of all these sorts of cloth.

When the weather is cold we put on thick warm wool clothing.

When the weather is warm we put on thin cotton clothing.

Cotton clothing is not as warm as wool clothing.

Thick clothing keeps us warm.

It keeps us warmer than thin clothing.

Thick cloth keeps air in it, between the threads.

The air does not let heat go through it.

A thick roof keeps the heat of the house in.

A thin roof let the heat go through it.

A thick roof keeps the heat of the sun out.

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Here is a pencil.

It is straight.

It is not bent.

Here is a glass of water.

I put the pencil in the water.

The pencil seems bent where it goes into the water.

The pencil is straight but it seems bent.

It seems like this.

But it is like this.

It is straight, not bent.

It seems bent, not straight.

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Before I put the pencil in the water it seems straight.

It was straight.

After I put it in the water it seemed bent.

It wasn't bent.

When it is in the water it seems bent.

When it is out of the water we see that it is straight.

Why did it seem bent when it was in the water.

This is a light.

A light sends out light.

The light which it sends out goes in straight lines.

Here is a bit of glass.

A ray of light is going through the glass.

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Where the light goes into the glass it is bent.

It is bent again where it comes out of the glass into the air.

Here is your eye.

You are looking at the pencil in the glass of water.

The light from the pencil is bent where it comes out of the water into the air.

It is bent here.

The pencil is not bent.

But the light from it is bent.

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The light comes from here.

But is seems to come from here.

The part of the pencil which is under the water seems to be where it is not.

Here is your eye.

The light from the pencil is bent here.

It comes out of the water here.

The point of the pencil seems to be here.

It is here.

The light is bent where it comes out of the water.

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This is a looking glass.

What do you see in the looking glass.

I see a girl's face in the glass.

She is looking at herself in the glass.

What does she see in the looking glass.

She sees herself in the glass.

She seems to be here.

She is here.

She is on this side of the glass.

she seems to be on the other side of the glass.

Why?

Because the glass sends the light back.

There seem to be two girls in this picture.

There is only one.