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The major question about such crease patterns is whether a given crease pattern can be folded to a flat model, and if so, how to fold them; this is an NP-complete problem. [32] Related problems when the creases are orthogonal are called map folding problems. There are three mathematical rules for producing flat-foldable origami crease patterns ...
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The time, materials and labor meant that an o-yoroi was a substantial investment for a samurai. [11] It was big, boxy armor designed for use on horseback and was loose fitting. The boxy shape hindered the samurai from using the sword with the free, fluid motion vital in hand-to-hand combat, hence the use of yari. [1]
Origami tessellation is a branch that has grown in popularity after 2000. A tessellation is a collection of figures filling a plane with no gaps or overlaps. In origami tessellations, pleats are used to connect molecules such as twist folds together in a repeating fashion.
In the Muromachi period, washi came to be used as ceremonial origami for samurai class at weddings and when giving gifts, [6] and from the Sengoku period to the Edo period, recreational origami such as orizuru developed. [10] During the Edo period, many books and ukiyo-e prints for the masses made of washi were published using woodblock ...
Kabuto (兜, 冑) is a type of helmet first used by ancient Japanese warriors that, in later periods, became an important part of the traditional Japanese armour worn by the samurai class and their retainers in feudal Japan. Note that in the Japanese language, the word kabuto is an appellative, not a type description, and can refer to any ...
The men-yoroi, which covered all or part of the face, provided a way to secure the top-heavy kabuto (helmet). The Shinobi-no-o (chin cord) of the kabuto would be tied under the chin. [ 4 ] Small hooks called ori-kugi or posts called odome located on various places would help secure the chin cord.
It would appear, according to Serge Mol, that tales of samurai breaking open a kabuto (helmet) are more folklore than anything else. [6] The hachi (helmet bowl) is the central component of a kabuto; it is made of triangular plates of steel or iron riveted together at the sides and at the top to a large, thick grommet of sorts (called a tehen-no-kanamono), and at the bottom to a metal strip ...