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'Origami' (Japanese: 折り紙 ori, 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


The "invention" of folding paper probably followed soon after the invention of paper itself. Paper was invented and popularized in China, and it is speculated that paper folding originated from Chinese paper folding. The earliest known traditions of paper folding were of ritual origin. The earliest known Japanese origami is probably ceremonial paper folding, such as noshi, which started in Muromachi era (1392 to 1573). The earliest known European origami is probably the baptismal certificate of 16th century, represented by a little bird (pajarita in Spanish or cocotte in French).
The word "origami" comes from two smaller japanese words, oru (which means to fold) and kami (which means paper). It came to be used occasionally for another kind of ceremonial folding, namely for "tsutsumi", or formal wrappers, by the beginning of the 18th century. However, its use for recreational origami of the kind with which we are familiar did not come until the end of the nineteenth century or the beginning of the twentieth. Before that, paperfolding for play was known by a variety of names, including "orikata", "orisue", "orimono", "tatamgami" and others. Exactly why the switch came to "origami" is not clear, it has been suggested that the word was adopted in the kindergartens because the written characters were easier for young children to write. Another suggestion is that the word "origami" was a direct translation of the German word "Papierfalten", brought into Japan with the Kindergarten Movement around 1880.
An origami design can be as simple as a party hat or paper plane, or as complex as a model of the Eiffel Tower, a leaping gazelle, a stegosaurus, or even a cuckoo clock that takes an hour and a half or longer to fold. Complex origami models normally require thin, strong paper or tissue foil for successful folding; these lightweight materials allows for more layers before the model becomes impractically thick. Modern origami has broken free from the traditional linear construction techniques of the past, and models are now frequently wet-folded or constructed from materials other than paper and foil. With popularity, a new generation of origami creators have experimented with crinkling techniques and smooth-flowing, sensual designs used in creating realistic faces, nudes, and other traditionally artistic themes.
Joseph Albers, the father of modern color theory and minimalistic art, taught origami and paper folding in the 1920s and 30s. His methods, which involved sheets of round paper that were folded into spirals and curved shapes, have influenced modern origami artists like Kunihiko Kasahara. Friedrich Fröbel, founder of the kindergartens, recognized paper binding, weaving, folding, and cutting as teaching aids for child development during the early 1800s.
Other famous origami practitioners in origami in the United States are Peter Engel, David Brill, Mark Kirschenbaum, Robert Lang, Joseph Wu, John Montroll, etc.
The work of Akira Yoshizawa of Japan, a prolific creator of origami designs and writer of books on origami, inspired a modern renaissance of the craft. His work was promoted through the studies of Gershon Legman as published in the seminal books of Robert Harbin Paper Magic and more so in Secrets of the Origami Masters which revealed the wide world of paperfolding in the mid 1960s. Modern origami has attracted a worldwide following, with ever more intricate designs and new techniques such as 'wet-folding,' the practice of dampening the paper somewhat during folding to allow the finished product to hold shape better, and variations such as modular origami also known as unit origami, where many origami units are assembled to form an often decorative whole.
Recent historians have uncovered the lost origami Tamatebako, a model from the folk tale of "Urashima-Taro and the Tamatebako". A three volume wood cut book, "Ranma-Zushiki", published in 1734, contained two pictures that were identified by Yasuo Koyanagi in 1993 as the Tamatebako model. Masao Okamura, an origami historian, was able to recreate the model. The model, contrary to common theory of traditional origami, involved cutting and gluing.
One of the most famous origami designs is the Japanese crane. The crane is auspicious in Japanese culture. Japan has launched a satellite named tsuru (crane). Legend says that anyone who folds one thousand paper cranes will have their heart's desire come true. The origami crane (折鶴 orizuru in Japanese) has become a symbol of peace because of this legend, and because of a young Japanese girl named Sadako Sasaki. Sadako was exposed to the radiation of the atomic bombing of Hiroshima as an infant, and it took its inevitable toll on her health. She was then, a hibakusha -- an atom bomb survivor. By the time she was twelve in 1955, she was dying of leukemia. Hearing the legend, she decided to fold 1,000 cranes so that she could live. However, when she saw that the other children in her ward were dying, she realized that she would not survive and wished instead for world peace and an end to suffering.
A popular version of the tale is that Sadako folded 644 cranes before she died; while her classmates then continued folding cranes in honor of their friend. Sadako folded more than 1,300 cranes before her death. She was buried with a wreath of 1,000 cranes to honor her dream. While her effort could not extend her life, it moved her friends to make a granite statue of Sadako in the Hiroshima Peace Park: a young girl standing with her hand outstretched, a paper crane flying from her fingertips. Every year the statue is adorned with thousands of wreaths of a thousand origami cranes. A group of one thousand paper cranes is called senbazuru in Japanese.
The tale of Sadako has been dramatized in many books and movies. In one version, Sadako wrote a haiku that translates into English as:
:I shall write peace upon your wings, and you shall fly around the world so that children will no longer have to die this way.
Taking Origami developments into the 21st Century, designer Jay Cousins created a simpler form of Origami in plastic - dubbed orikaso. Influenced by the purity and beauty of Origami, and Japanese design principles, Orikaso processes can be used to create functional and useful products.
See the World's Largest Origami Paper Crane at [http://www.sadako.org Sadako.Org] - This was put together by the World Peace Project for Children in 1999.
In 2002 Rick Nordal created the Origami Snowflake game. It is a paper folding game that challenges folders to make a sequence of geometric shapes with a single sheet of origami paper as quickly as possible. Much of the joy of origami is in the 3D nature and tactileness derived from the folding of a square sheet of paper. The game complements this, but in a new way.

Basic instructions


Most origami folds can be broken down into simpler steps. A list of techniques is accumulating in the origami technique tree. There is also a wikibook on Origami here for those who want more detailed information and instructions. [http://en.wikibooks.org/wiki/Origami]

Paper and other materials


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', is sold in prepackaged squares of various sizes ranging from 2.5 cm to 25 cm or more. It is commonly coloured on one side and white on the other; however, dual coloured and patterned versions exist and can be used effectively for colour-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.
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.
Folding a flat model from a crease pattern has been proven by Marshall Bern and Barry Hayes to be NP complete.
[http://citeseer.ist.psu.edu/bern96complexity.html]
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


Technical origami, also known as origami sekkei, 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.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Origami".