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>> Susan Osterhaus: Hello.
Today we're going to be folding a Net into a polyhedron.
A net is a two dimensional figure that can be folded
into a three dimensional object.
So that's what we call a Net, N-E-T.
And a polyhedron is a solid whose faces are all polygons.
And a regular polygon has congruent edges and faces.
It has faces that are regular polygons and an equal number
of edges meeting at the vertex.
So there is your math.
[ Laughter ]
All right.
And there happen to be only five convex regular polyhedrons
and they are named the Platonic Solids.
So those are the polyhedrons that we're going
to be concentrating on today.
And the faces of a Platonic Solid are all congruent,
regular polygons.
And as I usually say with my students,
once we've now got the vocabulary out of the way,
we'll just do our thing and I think you'll understand it
as we, as we use the real objects here
or create those real objects.
And the first way I'm going to do it is using swell paper.
So what I've done is I had pictures of these various Nets
and I copied them onto swell paper.
Now that's the paper that actually is rather flat
but has a, has a kind of a little bit of a feel to it
on one side and it's rather slick on the other.
And when you, as it is right now, it's, it's flat.
And in fact, let's see if we can get the camera to show how --
and so keep in mind that this is, this is flat.
It's a nice black line drawing but it's pretty muchly flat.
And we're going to run it
through the PIAF -- excuse me, the TY.
There's like three different manufacturers
of the tactile imaging enhancer.
This happens to be the -- let's see, yes.
This is the tactile image enhancer from Repro-Tronics
and I'm just going to put this on here
so you can get a close up.
This is after I've actually put one through that machine
and hopefully, if we tilt that a little more,
you can see that this one has some depth to it.
Believe me, your students will be able
to tell whether you've run it through the machine or not.
One time I was preparing some of these for a whole class,
so I had several students and I thought that I had run them all
through the machine to raise those drawings and sure enough,
one of the students it hadn't happened, and he raised his
up from a distance and goes, "Hey, Ms. O,
look what's wrong with this."
And I went -- I couldn't tell from a distance.
I couldn't see.
It looked good to me.
And then, of course, I came up close
and found out it was like this.
Now, maybe I'll put these down so you can see the difference,
how this one's raised and this is still very flat.
From a distance, it might look like it's the same thing,
but believe me; those students can tell if you've run it
through the machine correctly or not.
So I'm going to show you this so you understand.
As I said, you can pick whatever machine that you have available.
This happens to be a TY but there is a PIAF from Humanware
and there's something called ZyForm machine
from American Thermoform.
Okay. So I'm going to come over here to this machine
and let's see if we can get that on the camera
and I'm going to turn it on.
There's just a switch [machine noise] in the back.
It makes a nice little noise.
And there's, there is another *** on the back, which happens
to be turned to 13 so I'm going to leave it there.
I mean, guys, we're talking very simple.
You basically put it in on this side, let the rollers catch it.
It's got a heating element in there
and that particular element makes everything
that was flat rise and that black line master
that was just a black line master is now magically raised
because -- I'm going to turn it off because it's pretty noisy --
because of the fact that you had this machine
but you had this special paper.
So see, I haven't done a quick little exchange on you.
This just went through the machine and it is still raised.
Okay. So this is what happens.
Again, this was the one that was flat and now it's raised.
So now I have two raised ones.
But anyway.
This, this is pretty magical and the first time some
of my students saw this they were just like, oh wow.
And for teachers, I want to tell you how easy it was
for me to create this.
I don't know if you can see the fine print down here,
which also got raised.
Harcourt Brace School Publishers.
I just downloaded these from the website.
They were not meant for this at all.
These were, they were expecting someone to just print these
out on card stock paper and have regular,
in a regular classroom have those sighted students cutting
out and putting these things together.
But this is a very, very simple way for someone
to create a tactile Net for a student.
Now I'm not going to go ahead
and put this particular one together right now,
just for sake of time.
I don't think you need to be watching me cutting
out anything to elaborate.