- [Voiceover] All right, in this movie we'll begin
the creation of what I consider
to be a very fun real-world project,
and that's the False Mobius strip.
And what's so great about it is that
it brings together the skills that we've learned
over the course of the last three chapters.
So obviously we have custom gradients a la chapter 22.
We're gonna be creating the base ribbon
using an object blend from chapter 23,
and then we'll be weaving this ribbon
in and out of itself using Live Paint.
Now the reason I'm calling this a false Mobius strip
as opposed to a real one is because
when you're working with a real Mobius strip
there is no absolute front or back side.
And so let's say these cool stripes represent
the front side of the ribbon, then a ribbon flips across
to expose these warm stripes, which represent the back side,
then we flip around to the front side once again
and then we flip to the back, and so at some point
there's a seam between the back of the ribbon and the front
as we're seeing indicated right here.
And so, in other words, if you were a little person
walking along this surface, you could pass over
each one of these six times, each one of these
overlaps a total of six times, and you would cover the
front and the back side of the ribbon all the way around.
So it's one continuous surface.
The thing is, if you go ahead and cut out
this bright stripe right here all the way around,
then you ruin the illusion and you end up
with absolute front and back sides.
And to understand how that works,
I've created this diagram right here.
The front side appears blue and the back side appears red,
or if you prefer, we have a vice and a versa side
right here, and so we start with the front,
we flip around to the back, we see the front again,
then the back side of the ribbon, then the front,
the back, and then finally, we wrap around to the front.
And so we have a total of one, two,
three, four, five, six overlaps.
It's still a continuous ribbon, it's just that
it has a definite front and back side.
And so the reason that we're gonna create
this false Mobius effect as opposed to the real one
is because this project is a little easier to conceptualize
and it happens to be a lot of fun as well,
as you'll find out starting in the very next movie.