Ikebana a piece's color combinations, natural shapes, graceful lines, and the implied meaning of the arrangement. Another common but not exclusive aspect present in "ikebana" is its employment of minimalism. Some arrangements may consist of only a minimal number of blooms interspersed among stalks and leaves. The structure of some Japanese flower arrangements is based on a scalene triangle delineated by three main points, usually twigs, considered in some schools to symbolize heaven, human, and earth, or sun, moon, and earth. Use of these terms is limited to certain schools and is not customary in more traditional schools. A notable exception
Ikebana art. Still, there were occasional departures into unnatural curves and artificialities that caused a shift, and "nageirebana" again revived. Until then only one branch of "ikebana" had been taught at a time, following the taste of the day, but now rival teachers in both "rikka" and "nageirebana" existed. "Rikka" reached its greatest popularity in the Genroku era, and then commenced its decline. From the decline of "rikka", "nageirebana", the origin of the present "ikebana", grew in power and popularity. From this time on, it ceased to be called "nageirebana" and took the name of "ikebana". In the Tenmei era (1781–1789)