Katana
Appreciation

Historically, katana have been regarded not only as weapons but also as works of art, especially for high-quality ones. For a long time, Japanese people have developed a unique appreciation method in which the blade is regarded as the core of their aesthetic evaluation rather than the sword mountings decorated with luxurious lacquer or metal works.

It is said that there are three objects that are the most noteworthy when appreciating a blade. The first is the overall shape referred to as sugata which is the curvature, length, width, tip, and shape of tang of the sword. The second is a fine pattern on the surface of the blade, which is referred to as hada or jigane. By repeatedly folding and forging the blade, fine patterns such as fingerprints, tree rings and bark are formed on its surface. The third is hamon. Hamon is a fuzzy line in the white pattern of the cutting edge produced by quenching and tempering. The object of appreciation is the shape of hamon and the crystal particles formed at the boundary of hamon. Depending on the size of the particles, they can be divided into two types, a nie and a nioi, which makes them look like stars or mist. The pattern, nie and nioi of the hamon are generally difficult to see, and the viewer usually holds the sword in his hand, changing the angle of the light as it hits the blade. In addition to these three objects, a swordsmith signature and a file pattern engraved on tang, and a carving inscribed on the blade, which is referred to as horimono, are also the objects of appreciation.

The Hon'ami clan, which was an authority of appraisal of Japanese swords, rated Japanese swords from these artistic points of view. In addition, experts of modern Japanese swords judge when and by which swordsmith school the sword was made from these artistic points of view.

Generally, the blade and the sword mounting of Japanese swords are displayed separately in museums, and this tendency is remarkable in Japan. For example, the Nagoya Japanese Sword Museum "Nagoya Touken World", one of Japan's largest sword museums, posts separate videos of the blade and the sword mounting on its official website and YouTube.
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