In this video I'm going to show you
how to make a triangle twist, which is one of the
basic tessellation techniques used in origami.
It creates extra creases on a triangle grid.
If you look closely, you can see that
there are two triangles right here,
edge to edge,
and one of the creases on the center triangle
is between these two points.
And the same holds for the
other two edges of the triangle.
Note that you have to work on a triangle grid
and I advise you to have at least 8 divisions.
If you don't know how to make a triangle grid,
just check one of my other videos.
First locate a point on the grid
that is relatively central on the grid,
and then make mountain folds
on three of the creases on the grid
so that each pair of creases
encloses a 120-degree angle.
Or in other words, exactly two triangles
are in between them.
Just pinch those into mountain folds
like so.
Now, you have to decide whether you want
a twist counterclockwise or clockwise.
We're going to do one counterclockwise.
For that, you have to fold each of these
double layers - if you pinch the two sides together
you have two layers.
To fold them down, up and to the left
you're going to work counterclockwise.
If you want a clockwise (twist),
you just have to go up, to the right and down.
So you're going to go clockwise.
So, we're going to go counterclockwise.
And for that, just pinch these areas
all three of them,
and then flatten down along an existing crease.
You're not creating new creases yet.
Then the second one,
and then the third one.
Now you'll see that you cannot flatten in the middle,
but only right here - and there.
And here there's a lot of paper tension.
You want to really enforce that paper tension
and maybe push on the point a bit.
You'll see that a triangle starts to emerge.
Like so.
You want to flatten it down and
make new creases right there -
like so.
The creases are going to be
between points on the grid.
And then your triangle twist is all done.
