Shadow Illusion

We have that card with a little brown hole in it

And what I want you to do is hold it up

and try to cast the shadow on that wall there

Before you do it , we will see what it is

Shadow of the card with hole in it

We see an figure enlarged on the wall

It is not very pronounced but we can actually do see the little hole here

And ofcourse made

My next question for you is

You can have this card

What is that

Its a big hole

Can you tell me what size of hole you can see

Compared to the other one ,

Bigger

Twice the size may be

But still the card is larger than hole

What do you see

Big Hole

The card and the hole is slighly bigger than the previous one

Same thing just larger

Ok what I want you to do

It is approximately the same size as the last

Why dont we compare

Here you go

You were right It is One is bigger than the other

Oh goodness it actually looks about the same

Same size though

I cant believe that it must be the sun playing tricks with my mind

What about here is what I am really going to test you alright .Tell me what is there on that card

It is a triangle

So what do you expect to see on the wall.

A triangle but I wont be surprised to see a circle.

What can you see

A triangle

I am certain

Ok lets have a look

Oh wow

Thats all good for me

It is a circle

I can see a triangle

Well we are not going to see a triangle.

Why not?

Guess everything else has been a circle so it will be a circle

I am sticking to triangle.

Ok

It s a circle

Lets have a look I am interested

Well there you go its a circle

Do you want to compare to one of the others

I l give you the other one.

Oh my goodness I really like this project I am learning something

The sun is definitely playing tricks with my mind.

the sun is deceptive.

Thats great

Why are we seeing circles in all these cards regardless of the shape of the hole.

I really dont know. I would like to know.

When you take away the definition from any kind of shape its a thing its just a round

For example you get a perfect triangle

But it was a pretty decent circle

So you must get to a certain size here it doesnt matter what shape it is

It is just probably

Why is it going to a circle though

The sun looks round doesnt it But I am not sure if it has anything to do with it

The light is going through this little holes

And it is the sun, the sun sort of going through

these holes making the circle of the sun, I dont know

Exactly, you nailed it.

What you were looking at there was the image of the sun

Really?

Ya

The earth and sun is round

The sun is round I guess

The building is round

The building is round is it? No the building is not round.

So what we are seeing is

The projection of the sun

I have never thought about it before

I think you actually know and I think you actually have thought about it before.

But you are not queing the right part of your brain that knows the answer

Yeah. Probably.

There is a part of your brain that knows the answer

Well I did photography at school

And we did pinhole cameras

The hole actually reflects what it is showing

on the wall

So

So you see what you see on the other side

So what s that

So it is a sun

Well there you go.