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 of action. That warriors like Hideyoshi and Yoshimasa, two of Japan's most famous generals, found benefit in the practise of "ikebana" shows that it is valuable training, even for the masculine mind. "Rikka" reached its greatest popularity during the Genroku era. Many works on "ikebana" were published in the centuries from the Ken'ei (1206–1207) to the Genroku (1668–1704) eras, all founded on Sōami's idea of the three elements. The first of these works, published in the early part of the Ken'ei era, was a book called "Sendenshō", and there were many others, but none of much value to the student