## Valley and mountain fold

Post is a part of a larger series (Folds): Valley and mountain fold Swivel fold Sink fold Petal fold Rabbit ear How many folds exist in the origami. If you survey the internet, you will find out that there are many of them (Valley fold, Mountain fold, Inside reverse fold, Outside reverse fold, Rabbit ear, Squash fold, Swivel…

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## Axial creases

Post is a part of a larger series (Creases): Hinge crease Ridge crease Axial creases Axial crease is one of the three basic origami creases. By definition Axial creases are creases that run in the direction that is perpendicular to the polygon’s hinge creases. Simplest form of a axial creases In most basic form, meaning in the models…

## Hinge crease

Post is a part of a larger series (Creases): Hinge crease Ridge crease Axial creases A hinge crease serves two purposes. By definition, a Hinge crease is a line that defines polygons by the mere fact it surrounds it. Also, a hinge crease is a line around which a flap can rotate. Hence the name. It looks similar…

## Maekawa-Justin and Kawasaki-Justin theorems

Post is a part of a larger series (Design process): Origami design process (introduction) Origami design process – Part 2 Origami and circles Relationships between basic elements of an origami model Maekawa-Justin and Kawasaki-Justin theorems How to hide an unused paper in your Origami model? Can central flaps be free? Why is central fold opening so popular? Crease…

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## Why is central fold opening so popular?

Analysing various Origami models one can see that oftentimes central vertical crease is missing. Why is it so, and why many authors resort to such a solution is something I will try to explain in this blog post.

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## Can central flaps be free?

Post is a part of a larger series (Design process): Origami design process (introduction) Origami design process – Part 2 Origami and circles Relationships between basic elements of an origami model Maekawa-Justin and Kawasaki-Justin theorems How to hide an unused paper in your Origami model? Can central flaps be free? Why is central fold opening so popular? Crease…

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## Origami design process (introduction)

Origami is - I hope you understand - not some arbitrary, random paper folding technique that you use to create, almost by an act of magic, exciting paper models. Quite the contrary. Behind what is seemingly random paper folding there is a clear mathematical logic.

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## Origami and circles

How many times you have heard that origami is based on circles? Is it true? and if so, what does it mean? Well, in this blog post, I will try to answer these questions.