Ikebana room decoration and commenced in a rudimentary way to consider natural beauty in floral arrangement. At this time "ikebana" was known as "rikka". This same age conceived another form called "nageirebana". "Rikka" and "nageirebana" are the two branches into which "ikebana" has been divided. Popularity of the two styles vacillated between these two for centuries. In the beginning, "rikka" was stiff, formal, and more decorative while "nageirebana" was simpler and more natural. Although "nageirebana" began to come into favour in the Higashiyama period, "rikka" was still preferred, and "nageirebana" did not truly gain popularity until the Momoyama period, about a
Ikebana kuge (供華). Styles of "ikebana" changed in the late 15thcentury and transformed into an art form with fixed instructions. Books were written about it, ""Sedensho"" being the oldest one, covering the years 1443 to 1536. "Ikebana" became a major part of traditional festivals, and exhibitions were occasionally held. The first styles were characterized by a tall, upright central stem accompanied by two shorter stems. During the Momoyama period, 1560–1600, splendid castles were constructed. Noblemen and royal retainers made large decorative "rikka" floral arrangements that were considered appropriate decoration for castles. When the tea ceremony emerged, another style was introduced for