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The traditional crane and papers of the same size used to fold it

File:Pegase.jpg

A paper Pegasus designed by F. Kawahata

Origami (Japanese: 折り紙 oru, to fold, and kami, paper lit. "folding paper") is the art of paper folding. The goal of this art is to create a given result using geometric folds and crease patterns. Origami refers to all types of paper folding, even those of non-Japanese origin.

Origami only uses a small number of different folds, but they can be combined in a variety of ways to make intricate designs. In general, these designs begin with a square sheet of paper, whose sides may be different colors, and usually proceed without cutting the paper. Contrary to most popular belief, traditional Japanese origami, which has been practiced since the Edo era (1603-1867), has often been less strict about these conventions, sometimes cutting the paper during the creation of the design (Kirigami 切り紙) or starting with a rectangular, circular, triangular or other non-square sheets of paper.

History

Although some historians argue that Origami originated in China, where it was called "Zhe Zhi",^{[citation needed]} it is generally accepted that its actual development as an art form occurred in Japan.^{[citation needed]} Origami was mostly a traditional art for the amusement of children in China until Akira Yoshizawa spurred a renaissance of the art form with his new advancements, including wet-folding and the Yoshizawa-Randlett system of diagramming. In the 1960s the art of origami began to spread out, first with modular origami and then with various movements developing, including the kirikomi, purist and pureland schools of thought.

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Paper and other materials

File:Worldstiniestcrane.jpg

Some people fold miniature origami models as a challenge

Although almost any laminar material can be used for folding, the choice of material used greatly affects the folding and final look of the model.

Normal copy paper with weights of 70–90 g/m² can be used for simple folds, such as the crane and waterbomb. Heavier weight papers of 100 g/m² or more can be wet-folded. This technique allows for a more rounded sculpting of the model, which becomes rigid and sturdy when dry.

Special origami paper, often also referred to as "kami" (Japanese for paper), is sold in prepackaged squares of various sizes ranging from 2.5 cm to 25 cm or more. It is commonly colored on one side and white on the other; however, dual coloured and patterned versions exist and can be used effectively for color-changed models. Origami paper weighs slightly less than copy paper, making it suitable for a wider range of models.

Foil-backed paper, just as its name implies, is a sheet of thin foil glued to a sheet of thin paper. Related to this is tissue foil, which is made by gluing a thin piece of tissue to kitchen aluminium foil. A second piece of tissue can be glued onto the reverse side to produce a tissue/foil/tissue sandwich. Foil-backed paper is available commercially but not tissue foil. Both types of foil materials are suitable for complex models.

Washi (和紙) is the predominant origami paper used in Japan. Washi is generally tougher than ordinary paper made from wood pulp, and is used in many traditional arts. Washi is commonly made using fibers from the bark of the gampi tree, the mitsumata shrub (Edgeworthia papyrifera), or the paper mulberry but also can be made using bamboo, hemp, rice, and wheat.

Artisan papers such as unryu, lokta, hanji, gampi, kozo, saa have long fibres and are often extremely strong. As these papers are floppy to start with, they are often backcoated or resized with methylcellulose or wheat paste before folding. Also, these papers are extremely thin and compressible, allowing for thin, narrowed limbs as in the case of insect models.

Mathematics of origami

The practice and study of origami encapsulates several subjects of mathematical interest. For instance, the problem of flat-foldability (whether a crease pattern can be folded into a 2-dimensional model) has been a topic of considerable mathematical study.

Significantly, paper exhibits zero Gaussian curvature at all points on its surface, and only folds naturally along lines of zero curvature. But the curvature along the surface of a non-folded crease in the paper, as is easily done with wet paper or a fingernail, no longer exhibits this constraint.

The problem of rigid origami ("if we replaced the paper with sheet metal and had hinges in place of the crease lines, could we still fold the model?") has great practical importance. For example, the Miura map fold is a rigid fold that has been used to deploy large solar panel arrays for space satellites.

Technical origami

File:Origami dragon.jpg

Origami Ryu-Zin, designed and folded by Satoshi Kamiya

Technical origami, also known as origami sekkei (折り紙設計), is a field of origami that has developed almost hand-in-hand with the field of mathematical origami. In the early days of origami, development of new designs was largely a mix of trial-and-error, luck and serendipity. With advances in origami mathematics however, the basic structure of a new origami model can be theoretically plotted out on paper before any actual folding even occurs. This method of origami design was pioneered by Robert Lang, Meguro Toshiyuki and others, and allows for the creation of extremely complex multi-limbed models such as many-legged centipedes, human figures with full complement of fingers and toes, and the like.

The main starting point for such technical designs is the crease pattern (often abbreviated as 'CP'), which is essentially the layout of the creases required to form the final model. Although not intended as a substitute for diagrams, folding from crease patterns is starting to gain in popularity, partly because of the challenge of being able to 'crack' the pattern, and also partly because the crease pattern is often the only resource available to fold a given model, should the designer choose not to produce diagrams.

Paradoxically enough, when origami designers come up with a crease pattern for a new design, the majority of the smaller creases are relatively unimportant and added only towards the completion of the crease pattern. What is more important is the allocation of regions of the paper and how these are mapped to the structure of the object being designed. For a specific class of origami bases known as 'uniaxial bases', the pattern of allocations is referred to as the 'circle-packing'. Using optimization algorithms, a circle-packing figure can be computed for any uniaxial base of arbitrary complexity. Once this figure is computed, the creases which are then used to obtain the base structure can be added. This is not a unique mathematical process, hence it is possible for two designs to have the same circle-packing, and yet different crease pattern structures

Authors of books about origami

Akira Yoshizawa - reinvented modern origami. Created the modern repertoire of folding symbols
Robert J. Lang - Author of many Origami books including the new benchmark Origami Design Secrets
Peter Engel - influential origami artist and theorist
Tomoko Fusé - famous for boxes and unit origami
Robert Harbin - popularised origami in Britain; also presented a series of short programmes entitled Origami, made by Thames Television for ITV
Kunihiko Kasahara - devised a standardized method for creating any polyhedron
John Montroll - probably the most prolific Western artist and author of over 16 books on origami
Nick Robinson - origami artist and author of over a dozen books on origami
Toshikazu Kawasaki - Japanese mathematician famous for his Iso-area folding theory and his many geometric folds, including Kawasaki's "Rose"
Makoto Yamaguchi
Satoshi Kamiya - One of the youngest geniuses of the origami field
Norio Torimoto - Appointed Origami Master by the Nippon Origami Association in 2000. Gives lectures on mathematics using origami at The Royal Institute of Technology in Stockholm and other universites in Japan, Denmark and the UK.

Diagram links

Traditional diagrams

External links

Joseph Wu's Origami Page An extensive collection of links, with lots of organizations and topic-related pages sorted by an easy interface.
"Origami: Redefining the Art of Paper Folding" Profile and exclusive interview with Joseph Wu in CBC Radio 3 magazine with photos of his works, suggested links and readings.
The Lister List This is a collection of 115 essays by David Lister, one of origami's most eminent historians.
British Origami Society The U.K.'s central origami organization.
OrigamiUSA The biggest origami organization in the U.S.
Origami.com Large collection of diagrams, suitable for beginners.

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+[http://members.aol.com/ukpetd/trad.htm#publist Traditional diagrams]
 ==External links==