To get a beautiful flower design or an arrangement, you don't need to show all of these three. The most important here is that your design has ornamental flowers; you will still get a terrific and an artistic flower arrangement.
Etymologically, the origins of the name Ikebana comes from two Japanese words: ikeru, which means to give or conserve life, and hana, which translates as flower. There is an old Japanese saying relating to Japanese flower arrangement that goes kokoro wo ikeru, which literally means to give life to your heart. In all cultures, nature has always been an essential source for healing of the soul. In Japan, the use of flowers to enrich the spirit has been part of the culture since ancient times. By extension, Ikebana is also considered a form of artistic expression meant to enrich and heal the spirit.