753
Okay. Oh, boy.
Hey, Uncle Norm. Hey, kids.
Oh, wait. You look
different today. You're so right, Kevin.
You got a haircut? Uh, new running shoes. That's it.
Doesn't anything draw your attention?
We're just teasing you, Uncle Norm. You were some kind of a weird
masks. Think that's right.
Well, you kids really had me going funny.
So what's Thea Mask for? Well, you know, my
secret hush hush work.
No, not really. You never explain that.
Well, that's because I'm doing my job properly.
Um, in any case, my co workers and I were a
rather artistic bunch. And every now and again, we like to get
together and share our artistic creations at a kind of party.
Yeah, I mean, a meeting. A very, very serious,
important meeting. And this year, we're
making masks. What do you think?
Yeah, it's a stinker. Uh, no,
it only in a sort of big, kind of stinks kind of
way. Yeah, and not so
good ish kind of way. Thanks, kids. I
really needed that. You know what I'm thinking
that you know someone who can help us, and we should get over there immediately. Right?
Good guess, Uncle Norm, this I gotta see.
Jason, this is Jason. Thanks for making time for us
today. The thing is, I'm going to a costume
party. It's a kind of hush hush. I can't
say very much about it, but we're all supposed to wear masks
and well, obviously the cooler, the mask the better. And,
well, as you can tell from my sense of style when it comes to cool, I
am it. We were hoping that you could give us some tips on how to make
a really unique mask for Uncle Norm. Sure, I could definitely help you guys with
that. Oh, that'd be great. You know what? Because at Atlanta said that you could help me face
up to my problems. Fakes up, Doug. I just
thought of that right here, right now. The joke.
Well, the first thing we're gonna do to create a mass is we're gonna have to talk about symmetry,
symmetry that sounds more like math and art. To
me was a photographer. I'm always looking for things that are interesting to photograph.
And one thing I always look for something that has bilateral symmetry by
bicycle seem to what now you kind of lost me there at the end.
Not bicycles. Uncle Norm. Bilateral symmetry, Bilateral
symmetry. Okay. And like a like a bicycle, it has two wheels.
An image that has an object that has bilateral symmetry has two equal
sides that are a mirror image of each other at least most of the time.
This reminds me of when we used to make Valentine's Day hearts
class. Way would take a paper folded in half,
cut half of the heart out on
it would give us by ladder symmetry, making both halves
identical. Want to see something really interesting? Atlanta grab a seat and I'll take it.
So what I'll do is I'll actually split the image right down the middle.
We'll draw a line right down the middle of the face, and what I'll do is I'll take
both right sides of the image and then copy them. So
I'm gonna duplicate the right hand side and then flip it.
And then I'm gonna join the two right hand sides up together, and we'll see how
much bilateral symmetry fix actually has.
Oh, not too much looks like a different girl all
together when it comes to people's faces. They're not exactly
bilaterally symmetrical. I see. That's fascinating,
Right? Hold. Bilateral symmetry gives
us identical halves. Except for
things like facial photographs. My lateral
symmetry gives you identical, except for things like facial
photographs. Can you believe this is,
in fact as, ah, bit of a token of
appreciation? I wanted to present you. I mean, since you were
a photographer and an artist, you appreciate the finer
things is called brown Opel Norm number 17. Thanks,
Uncle. You don't have to thank you.
Clothe.
Oh, yeah, but natural symmetry. You've got 11.
There's nothing quite like it.
Yo, check this out. This whole bilateral symmetry thing
may be new to you and me, but it's been used for hundreds of years.
Leonardo da Vinci, the famous Italian artist, saw symmetry and
art over 500 years ago,
and he didn't even have a digital camera. But even way back
that he knew what he was doing, he knew that 1/2 of the
body was a mirror image of the other half. See how
each side looks identical to the other one. It's like looking at a
reflection two identical house, or that's how it seems
bilateral symmetry is all over the place in nature. The
two sides or hives off the butterfly look perfectly
symmetrical. But if we take 1/2 of the butterfly,
flip it over and placed it here next to that first half.
Look what happens now. The two halves are exactly the same
because one's a mirror image of the other one. Now compare this
butterfly to the original one.
You can see that they're slightly different.
And this same sort of a proximate bilateral symmetry can
be seen in spiders too. And some bats.
Now, let's see what Uncle Norm's during with this mask.
Oh, right. Are you ready to make your mass? Oh, boy, I am so up. I'm
surprised I'm not this far off the ground. What? You came in?
I think I can face it. Face it.
All right, well, let's get to it. Here is our vertical
line Cracks is Yeah. And with Kevin's face, you know, it
seems to be bilaterally symmetrical. But actually,
two halves aren't identical. They're not know. So what we're gonna do is we're
gonna take two left sides and put them together
and look at what we get. Ooh, two left sides make
speaks. You look like you've been working out more. You sort of get larger.
Okay? And Uncle Norm. Hey, that looks like me. It is
you. That's my picture. Yes. So we put the
vertical line, and then do you want to see your right side of your left side?
Let's go. Left side left. Okay.
There you go. You're sort of stretched out. Yeah, kind of makes me heavier.
What if we went the other way too? Right side's. Okay? Sure. To right
Side's space. Alien
she person. Well, there you go. So now we can start
making your masks. Let's do it.
Hello. I am Kevin. I have no
emotions. Hey, how long
more? How you doing me, Sereno? Oh, good impression.
Looking into a mirror.
This'd so
breaking it. It's like the fourth dimension because there's
123
identical. Uncle Norm's question is,
which one is the real me?
Oh, boy, this is totally symmetric. A
cious. You know, I just have a couple of finishing touches to
add. See you kids later. Well, Uncle Norm finishes up. I'm gonna
show you how to make something really cool at home.
We see the shapes yours from fold
in Rio.
So making Uncle Norm's mask was really, really fun. But I'm gonna show you
something that's even cooler. We're gonna be making a symmetrical
butterfly. So here's what you need to do. You take a piece of paper
one like this and you fold it in half
right down the center. And once you do that, you're going
to take a pencil and draw
half of a butterfly on this side. And, of course, the butterfly can be
any shape you want. It's your creation. So once you've done that, you're gonna take
your scissors and cut out the shape. You want to make sure that you
cut on the line
just like that. Now, here's the really cool part. When I opened
it up, I get one full butterfly. That's the
access of symmetry, meaning that the shape on either side of the line is
symmetrical or exactly the same mirror images of each other.
Okay, now, here's the part where you get to decorate it so you can take
any colored paint you want. I'm going to choose yellow. First
you take your paint, and only on one side of the butterfly
you start dabbing.
Okay, so take the blue paint. Next on, do the exact same
thing, King who finally I'll
take my orange paint and do a couple more dubs.
Okay, now what you have to dio is folded in half
and really carefully, just like
that. Now you want to make sure that you gently press down. You
don't want to rub the butterfly or else your design will get all
smudge. Now look at this.
Pretty cool when we open it. We have the exact same design on either side of the
line. See mirror images of each other.
So get your friends in on it. Remember, bilateral symmetry can be
fun.
E.
I think I know what I'm doing.
That's right,
Woo. You kids really had me going. I had lots of
fun making the mask. Oh, and how did your party?
I mean meeting with your hush hush
pals go anyway. Oh, Kevin, it was mask tacular.
There are all kinds of different masks there. There was a ah, butterfly
mask and a full moon mask and a
bright red maple leaf. Well, I'm glad you had
fun, Uncle Norm. Yeah, And your mask. It's terrific. both
sides are identical. Well, you flatter me. It's
just bilateral symmetry. Very
catchy. Who? You flatter me. It's just
bilateral symmetry. I like it. I like
that
way. See the shapes?
Yours drum fold in Rio
Now you know. Cool. Bye.
The tree gives you
way. See the shapes? Yours
drama way Folding
vertical line. Now you know.
Cool mystery
way too
tree. Oh, yeah.
Bilateral symmetry. You got 11. There's nothing
quite like it's so
Yeah.