Japanese swords in fiction
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Many legends surround Japanese swords, the most frequent being that the blades are folded an immense number of times, gaining magical properties in the meantime. While blades folded hundreds, thousands, or even millions of times are encountered in fiction, there is no record of real blades being folded more than around 20 times. With each fold made by the maker, every internal layer is also folded, and so the total number of layers in a sword blade is doubled at each fold; since the thickness of a katana blade is less than 230 iron atoms, going beyond 20 folds no longer adds meaningfully to the number of layers in the blade. Folding a blade only ten times will therefore create 1024 layers; 20 times will create 1,048,576 layers.
Furthermore, while heating and folding serves to even out the distribution of carbon throughout the blade, a small amount of carbon is also 'burnt out' of the steel in this process; repeated folding will eventually remove most of the carbon, turning the material into softer iron and reducing its ability to hold a sharp edge. This can be combated with carburization, though it does not produce even carbon distribution, partially defeating the purpose of folding.
Some swords were reputed to reflect their creators' personalities. Those made by Muramasa had a reputation for violence and bloodshed, while those made by Masamune were considered weapons of peace. A popular legend tells of what happens when two swords made by Muramasa and Masamune were held in a stream carrying fallen lotus petals: while those leaves touching the Muramasa blade were cut in two, those coming towards the Masamune suddenly changed course and went around the blade without touching it.
Kusanagi (probably a tsurugi, a type of Bronze Age sword which precedes the Katana by centuries) is the most famous legendary sword in Japanese mythology, involved in several folk stories. Along with the Jewel and the Mirror, it was one of the three godly treasures of Japan. A common misconception is that Katanas magically sprung into existence in Japan, utterly isolated from the mainland. The technique of folding steel came from the manufacture of the Dao in China, and contact with the mainland would affect how the katana evolved through the centuries. The katana design itself was developed over hundreds of years and the katana design was a development of the Tachi.
The most common depiction, especially in the Western world, of the Katana is a weapon of unparalleled power, often bordering on the physically impossible. Katanas are often depicted as being inherently "superior" to all other weapons possessing such qualities as being impossibly light, nigh-unbreakable and able to cut through nearly anything. By contrast, traditional European weapons are often depicted as clumsy, crude and unwieldy by comparison.
It is the prime weapon of choice for Japanese heroes in historical fiction set before the Meiji period. Carrying a non-sealed katana is illegal in present-day Japan, but in fiction this law is often ignored or circumvented to allow characters to carry katana as a matter of artistic licence. For instance, some stories state that carrying weapons has been permitted due to a serious increase in crimes or an invasion of monsters from other dimensions. With this law in mind, katana are sometimes used for comic relief in anime and manga set in the present, although this is sometimes replaced by the use of a bokken having surprisingly comparable capabilities. In the film Kill Bill, the main character is permitted to bring her katana on board an airliner; presumably, this is a policy of the fictitious Japanese airline, as other passengers can also be seen carrying swords.
Due to the renowned quality of the sword and the mysticism surrounding the relationship between the blade and its wielder, the katana appears in various works of fiction, including film, anime, manga, other forms of literature, and computer games. It is frequently used by non-Japanese creators, partly due to its status as an easily recognizable icon of Japan and its high reputation as a formidable weapon in skilled hands. Four well-known appearances in Western culture are Bruce Willis' weapon of opportunity in Quentin Tarantino's "Pulp Fiction", the Bride's signature weapon in Kill Bill (a film strongly influenced by Japanese samurai movies), the katana used by the main characters in Highlander and the 1975 Tom Laughlin action/cult Western film The Master Gunfighter. Other iconic appearances for the western audience include a pair of Ninjato carried by the character Leonardo in the Teenage Mutant Ninja Turtles franchise.
Manga and anime
Manga and anime show a prominent feature of katana for specific characters. In the manga Bakuman, the characters while researching on the commonality between the popular manga styles, mentioned Japanese swords are always present in them, including InuYasha, One Piece, Bleach, Gin Tama and various other examples.
There are also several manga series that were inspired by the Japanese swords. Kamata Kimiko's Katana is one such series; it is heavily imbued with the theme of katana with the story plot following an extraordinary teenage boy with the ability to see the 'spirit forms' of swords.
The sakabatō (逆刃刀) is a type of katana from Rurouni Kenshin, wielded by Himura Kenshin. It is a “reverse-edge sword”, translated in the English-language dub as a “reverse blade sword”. Some companies have created true replicas of the sakabatō.
The sharpened edge is the inward curved, longer side of the blade – the opposite of a standard katana – making it extremely difficult to kill an opponent; it generally knocks the wielder's enemies "senseless" rather than killing them. The only way for the sakabatō to cut is to rotate the hilt by 180 degrees within the hand, thus holding the sword backwards. The sakabatō symbolises Kenshin's oath not to kill again.
Video games also provide frequent appearances of the katana, most with unique characteristics. Kaede, the protagonist of the arcade series The Last Blade, Yoshimitsu, the well known ninja from Tekken, and Mitsurugi, the Japanese samurai from the Soul series also wield Katanas as their default weapons. Katanas frequently appear in role-playing video games, such as some Elder Scroll games like Morrowind, Oblivion, Skyrim or Neverwinter Nights, as weapons; often faster than a longsword yet less powerful. One of the recent appearances of the katana in another video game series is in Left 4 Dead 2, a game made by Valve.
Teenage Mutant Ninja Turtles (1987) deals with it twice. In "Ninja Sword of Nowhere", an alien spacecraft left a fragment of an alien metal, used to travel between dimensions in a mere microsecond, on Earth thousands of years ago, before a craftsman found the alien metal, forging a Japanese sword. This creates a legend of a sword which allows its owner to show up and disappear whenever he or she wishes. Even "Sword of Yurikawa" has a plot with an old Japanese sword.
- Stone, George Cameron (1999). A Glossary of the Construction, Decoration, and Use of Arms and Armor in All Countries and in All Times. Dover Publications, Inc. p. 460. ISBN 0-486-40726-8.
- Strongblade Sword Lore: History / Origin of Japanese Swords
- "TMNT: The Rennaissance [sic] Reptiles Return". Kung Fu Magazine. Retrieved 2009-12-27.
- Bakuman chapter 3, P.14
- Solomon, Charles (April 10, 2005). "Japanese feudal epic bursts from page". San Francisco Chronicle. Retrieved November 12, 2009. "a sakabato [is] a reverse-blade sword: the inner edge is sharpened, rather than the outer one. It can knock his enemies senseless, but doesn't inflict fatal wounds."
- Olivier, Marco (2007). "Nihilism in Japanese Anime". South African Journal of Art History 22 (3): 66. Retrieved November 12, 2009.
- Episode Guide