Sanbonsugi: The sanbonsugi hamon is characterised by a series of a few evenly spaced waves that resemble pine trees. It is usually related to the Aoe form of sword-creating which is known for its easy and stylish appearance. throughout the Muromachi time period (which spaned 1337 to 1573) the swordsmiths worked to best the Katana. They did so by