Sogetsu is a relatively modern (20th C.) school of Ikebana, which is the traditional Japanese art of flower arrangement. Sogetsu retains the spirit of Ikebana, expressing the essence of something that it is particular to the materials and the moment,  but it can be done by anyone, anywhere, anytime, with any kind of material.  The five slideshows below show examples done at different scales.

This slideshow of large arrangements shows how sogetsu can easily evolve using the same containers and plant material.  Sogetsu can be about product (making something that is meant to be enjoyed for a long period of time) or process (making new things continuously). These pieces are over 20 ft tall.

More large sogetsu.

Mid-sized sogetsu - most can be easily created by one person of any size. These pieces range in size from 6 ft to 10 ft tall.

Smaller, table-top sized sogetsu.

Suspended sogetsu - aka mobiles made of dried plant material