This base is another that is widely used in origami. The Bird Base consists of the Square or Preliminary Base, followed by two petal folds. The famous origami crane is folded from this base as well as many other models, including birds, stars and more.
The instructions below are just one method of folding the Bird Base.
For other methods of folding this and other origami bases, see this page:
Introduction to Folds and Bases Used in Origami
To fold the Bird Base:
First fold the Preliminary or Square Base, Steps 1 to 8.
1. Position a square of paper on your work surface so that its points are facing up and down, left and right.
2. Bring the left point over to meet the right point. Crease and unfold.
3. Bring the top point down to meet the bottom point. Crease and unfold.
4. Turn the paper over and position the square so that its edges are facing up and down, left and right.
5. Bring the left edge over to meet the right edge. Crease and unfold.
6. Bring the top edge down to meet the bottom edge. Crease and leave folded.
7. Grasp the resulting rectangle at its left and right sides and push inward. The folds you made previously should allow the model to collapse into a diamond shape with one folded flap sticking out towards the front of the model and one sticking out towards the back.
8. Fold the front flap to the left and fold the back flap to the right so that your model will lie flat. The model will have one open end.
9. Position the model so that the open end is pointing toward you.
10. Bring the lower left edge of the model's top layer over to meet the vertical center crease. Leave folded.
Repeat with the lower right edge.
11. Bring the top point down as far as it will go. It will cover the top of the folds you have just made.
Make a strong horizontal crease and then unfold both the top point and the left and right triangles.
12. Pull the bottom point of the model (top layer only) up toward the top point. The top layer should collapse along the existing crease lines as you move upward and you should be able to take the bottom point up an over to lay flat on the work surface. The result will be a long, skinny diamond shape with the 2 raw edges meeting each other along the center, causing a slit to form.
The------------------------------------------------------------- skinny diamond will be sitting on top of a somewhat larger diamond-shaped bottom layer..
13. Turn the model over from left to right.
14. Repeat Steps 9 to 12 on this side of the figure.
Your Bird Base is completed. It will be a long, skinny diamond shape that will now be cymmetrical and multi-layered.
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