Traditional:

This base is the starting position for countless models, which range
from the simple to extremely complex.

Description:

A kite shape with the tail end comprising 4 points that meet in a
single point at the tip of the tail: 1 at the front layer), 1 at the
back layer, and 1 on either side in the middle layer

Method:

1. Begin with a Preliminary
base, colour side out and the four points down.

You have two main layers to the model, each consisting of two single
layers themselves.

Label the points A to D starting at the top poing (middle of the
original square), in a clockwise direction.

2. Working with the top main layer of the model, valley fold line BC
(raw edge) to lie along the centre line of the model (AC).

3. Repeat Step 2 with the left hand side of the model.

You now have a triangular flap meeting at the centre line, AC, with
their right angles next to each other.

Let the line running horizontally from left to right across the top
edge of the triangular flaps formed in steps 2 and 3 be named EF: E is
the point at the left, and F is the point at the right of that line.

4. Valley fold along line EF, so that point A is now lying on top of
the model, along the centre line of the model.

5. Crease all flaps firmly and unfold back to Step 1.

6. Lift the bottom corner, top single layer only, and valley fold
upwards on line EF.

While doing this the raw edges will begin to come into the centre to
lie alone the centre line of the model.

Allow this to happen, the bottom halves will fold in on the
pre-creased diagonal valley folds; while the top halves will meet
resistance on diagonal mountain folds. Overcome this resistance and
convert them to valley folds.

7. When the bottom corner has been lifted all the way up to lie flat
on the table, the raw edges will meet along the centre line.

8. Turn the model over and repeat Steps 2-7 on the other side.

9. You should now have a tall, thin diamond that has 2 points at top
(one lying on top of the other); and 2 at the bottom (lying next to
each other).

There is a smaller point (The centre of the original square) between
the front and back flap.

10. Bring the top front point down infront of the model, valley
folding along line EF.

Bring the top back point down to the back of the model, valley folding
along line EF.

This is the usual way to orientate the bird base.

For a plain text file of these
instructions **click here.**