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
Runestone styles Pr2 correspond to the Ringerike style, whereas Pr3, Pr4 and Pr5 belong to what is more widely known as the Urnes style. Below follows a brief presentation of the various styles by showing sample runestones according to Rundata's annotation. RAK is the oldest style and covers the period 980-1015 AD, but the Rundata project also includes the older runestones in this group, as well as younger ones. This style has no dragon heads and the ends of the runic bands are straight. This style is from the period c. 1010/1015 to c. 1040/1050, when Pr3 appeared. It is characterized by