In the History of the Blintz, we saw how the blintz enabled people to design origami animals with more flaps. In this article, we shall look into this in some more detail using a dragon I designed in the early ’80s. Photo folding instructions of the dragon are available as a PDF.
Blintzing a Dragon
The dragon is based on ideas in the Flying Pegasus1 by Edward Megrath.
The dragon basically is a four-legged crane. The folding starts with the blintzed square base2 and continues through the stages illustrated in the crease patterns below.
Note the complex center of the latter two crease patterns. Could we have obtained the eight flaps directly from the blintzed square base or the blintzed bird base? It turns out that the answer is yes and no.
Yes: As seen in the crease patterns, we can formally achieve this. But no: Basically, the center is the same length as the flaps and ends up locking two of the flaps together on each side. You can see this in the left photo below.
Comparing the Blintzed Lily Base
Another example is a blintzed lily.
This model goes through the stages of the crease patterns below.
Note how this is folded directly on the lily base, sinking the bottom of the blintz flaps inside the lily. Could we have done this with the dragon?
Again, the answer is no. The illustrations below show that yes, the flaps occur freely and may be folded independently. But no, the center, or “body,” becomes huge compared to the flaps, which is not what we want. The dragon base above ensures a square base and a bird base with all eight flaps having a full degree of freedom, essentially by sinking the center into something that lowers itself below the flaps and without locking neighboring flaps.
Of course, a big center and eight flaps around it makes for a nice octopus doodle:
Inner and Outer Blintzes
All of the standard bases end up having an inside and an outside, typically with the front of the paper covering the outside. The blintz is done before folding the base, and we have a choice between blintzing on the front side or the back side of the paper.
When we fold the base with the blintz on the back side, we call it an “inner blintz”or “inside blintzed base” as the blintz flaps end up on the inside of the folded base. Similarly, we call it an “outer blintz” or “outside blintzed base” when we fold the base with the blintz on the front side of the paper.
The pegasus base above utilizes an outer blintzed bird base. Incidentally, the same book that had the Pegasus featured a turtle with an inner blintzed bird base.
Pat Crawford’s iconic turtle3 is a great example of an inside blintzed bird base. The blintzes become the four feet of the turtle, whereas two of the bird base flaps become the head and the tail, and the two others become a sturdy lock on the underside creating the 3D shell.
In both the turtle (inside blintz) and the dragon (outside blintz), the blintz flaps end up being pulled out to the same position. So why choose one over the other?
- With the inside blintz, the points cram together at the center. They need to be folded very accurately. Thus, with skewed squares or slightly sloppy folding, the outer blintz might be a better option.
- When doing the petal folds of the bird base, the outside blintz is pulled around the folded edge and is difficult to keep in place. The inside blintz is locked on the inside and easier to keep in place.
- In the turtle, the bird base is stretched, which effectively makes a closed sink of the center top of the bird base. That makes it slightly more difficult to pull out the outside blintz flaps than the inside blintz flaps.
- In the final pull-out step, the outside flaps are automatically in the right position, whereas the inside flaps need to be reverse folded.
Hence, the choice between inside and outside blintzes for these two models depends on accuracy and on the convenience of the folding sequence.
1. Robert Harbin, Origami 3 — The Art of Paper Folding (London: Coronet Books, 1972), 159. ISBN 0-340-16655-X. [back]
2. The square base is often called the preliminary base — even though it is no more preliminary than the blintz or the triangle base (which, to boot, is often called the waterbomb base). Editor’s Note: While the base is generally called the preliminary base in the United States, we are retaining the term “square base” for this article. [back]
3. Harbin, Origami 3 — The Art of Paper Folding,156. [back]